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SEL’SKOKHOZYAISTVENNAYA BIOLOGIYA [AGRICULTURAL BIQLQGY1, 2014, № 6, pp. 15-25
ISSN 313-4836 (Online)
UDC 632.6:[599+598.2 doi: 10.15389/agrobiology.2014.6.15rus
doi: 10.15389/agrobiology.2014.6.15eng
MAMMALS AND BIRDS AS AGRICULTURAL PESTS: A GLOBAL
SITUATION
S.M. GOVORUSHKO
Pacific Geographical Institute, Russian Academy of Sciences, 7, ul. Radio, Vladivostok, 690041 Russia Far Eastern Federal University, 25, ul. Oktyabrskaya, Vladivostok, 690070 Russia, e-mail [email protected] Received February 11, 2014
Abstract
On the globe there are approximately 7 thousand species of pests injuring agricultural crops. Because of pests’ activity from 33 % (D. Geinrikh et al., 2003) to 40 % (D. Pimentel et al., 1999) of world agricultural products are lost with annual financial losses estimated at $ 244 billion (D. Pimentel et al., 1997). In spite of the fact that the consequences of plant diseases and harmful insects for plant growing and forage production are discussed more often, economic loss caused by mammals and birds, is quite significant. It surpasses substantially losses put by nematodes, mites and molluscs, though far less than caused by harmful insects. As a whole it is to be noted that size of damage from mammals and birds as agricultural pests decreases gradually, remaining, however, still high. The reason of it consist both in application of modern scientific-design development (new technologies of harvesting, methods of pest control, etc.) and decreasing of populations size of wild animals due to reduction of their area and deterioration of the conditions of the habitat. As a preferred group of animals — agricultural pests, rodents were chosen. Their impact on condition of such branches, as production of grain, forage grasses and ensilage crops as well as vegetable growing, orcharding, and melon-growing is described. In California the annual economic loss from Spermophilus beecheyi at grain production is $ 8-12 million (S.A. Shwiff et al., 2009). Methods of struggle with rodents are presented. Other types of mammals, the most significant from the standpoint of their injuriousness are described. Information on their composition in a series of world regions is presented. For instance, they are deer, raccoons, and coyotes in the USA, and wild boar, bear and some ungulates in forest temperate zone. The figures of financial loss from them in some countries are given. Impact of plant-eating and omnivorous species of birds on grain-growing, gardening, vegetable growing, seed farming, and breeding of new cultures of plants is considered. In Australia more than 60 avian species are the pests of garden plantings, which cause the annual material loss of $ 300 million (Yu.M. Markin, 2008). The species of birds the most harmful on a global scale are listed, the figures of economic losses from them for a series of countries are presented.
Keywords: rodents, pests, economic loss, damage control measures, globe, agriculture, mammals, birds.
A global influence of nature on people activities as well as anthropogenic
impact on environment are suiveyed according to the program for the study of human interaction with the environment (1). Pests are a biotic factor which largely determines the effectiveness of providing mankind with food. The issue is very important because of the extent of the damage caused. In the world the losses from 33 % (2) to 40 % (3) and their annual estimation at $ 244 billion (4) were reported.
On the globe there are approximately 7 thousand species of pests damaging agricultural crops (4), the distribution of four of them is illustrated by Fig. 1. Most of them are insects (Insecta). A number of harmful pests are mites from Arachnida class related to insects. Some pests are described among Mol-
Fig. 1. Global distribution of some mammals and birds damaging agricultural crops: 1 — rooks, 2 — cockatoo, 3 — elephants, 4 — raccoons (http://commons.wikimedia.org; http://www.waza.org).
lusca: Gastropoda and Vermes: Nematoda).
In this article the role of mammals and birds as agricultural pests are discussed.
Rodents. General characteristics. This is the most damaging pests among mammals. Basically they are small animals ranged in weight from one or two dozen to a few hundred grams. Rodents are mainly herbivorous, but in the diet of many species there are also insects, larvae of invertebrates, small reptiles, etc. Rodents differ according to the plant foods they consume. Many species feed on the green parts of plants, which also serve as a source of water. Other rodents require a high-calorie food, and seeds are their preferable diet. In the absence of the necessary feed rodents easy enough change the energy source, for instant they can eat the bark of trees in winter (5).
Extremely high fecundity is a characteristic feature of rodents. The number of small rodents (mice, voles), giving birth to 3-12 cubs up to 5 times a year, can in some years grow 100 times or more (6).
In Russia the rodents damaging the field crops and trees are from Sci-uromorpha, Glirimorpha and Myomorpha groups. Among Sciuromorpha some species such as Pteromys volans L., several species of marmots and ground squirrels, Castor fiber L. and C. canadensis are considered the potential pests. In Glirimor-pha the Eliomys quercinus L., Glis glis L., etc., are potentially harmful. The harmfulness of these pests is mainly not high because of their low number.
With regard to pest species number and their harmfulness the Myomor-pha group is the most important. Spalax microphthalmus Guld., Cricetus crice-tus L., Arvicola terrestris, Clethrionomys glareolus Schr., Microtus arvalis Pall., M. levis and M. socialis are the pests from this group.
Rodents mainly damage grains, vegetables and fruits. Herbivorous forms additionally harm grazing livestock. The harmful effect of rodents is primarily due to their diet
The impact of rodents on crops. On grain crops the harm caused by rodents is quite diverse. Rodents can dig up the sown grain, devour seedlings, gnaw stems, cut and eat the ears, etc. The crop losses vary greatly depending on the pests. In the years favorable for their reproduction the consequences are disastrous. For example, in 1914 in Ukraine voles destroyed 80 % of all crops of rye and wheat. In Czechoslovakia in 1950 the damage of winter wheat, rye and barley crops was estimated at 22.3-68.7 %, 19.1-71.6 % and 8.5-15.0 %, respectively. However, even in the years when their number is not above an average score the damage they cause can be quite significant. Thus, in Rostov Province in 1977 the wheat yield was 2.8 or 1.8 t/ha in cases the defense measures against voles were or were not applied (5).
In Indonesia rodents are the main pests on rice crops decreasing the yield by 15 % and more. In Tanzania rodents consume 5 to 15 % of the corn crop (7). In the south-eastern Australia house mouse (Mus domesticus) in some years reduces the wheat yield by 3-4 % (8). The annual damage to grain production in California only by California ground squirrel (Spermophilus beecheyi) amounts from $ 8 to 12 million (9).
In XX century the losses were mostly related to knitting sheaves at harvesting. Nowadays, in the regions with simultaneous ear maturation the direct harvesting is applied excluding storage of sloping plants in the field and thus significantly reducing the damage caused by rodents. Nevertheless, in case of harvesting by separate combining, when plants are mowed and then dried to ripeness in rolls, the damage from rodents remains significant.
During the development of virgin lands, where the combination of virgin and cultivated territories creates the optimal living conditions for Citellus, the
damage caused by them was huge. For example, in 1957 in Alma-Ata region gophers completely destroyed 900 ha of winter wheat crops (5). The greatest damage was typical for a field edge of 50-100 m, where up to 60-80 animals per 1 ha were often caught. Nevertheless, their number was managed and the grain loss minimized.
So far as gophers can cause damage throughout the plant development cycle from seedling emergence to heading, their harmfulness is high. Another important trait is their voracity, as one animal is able to eat up to 22.5 kg of wheat for the season (10). Thus, during the development of virgin lands the losses could amount 1.8 t/ha. Currently, however, due to a sharp decline in the number of gophers they have no economic value. Some destruction of cereal crops is also caused by jerboa, damaging mainly the shoots of maize and wheat, and by hamsters.
Rodent-related damage to vegetable and melon crops. In general, such feeding behavior is less characteristic to rodents and these plants are extra components in their diet. However, the damage is rather clear. Wood mouse damages vegetables and melons on the distance up to 2 km from the woods. It gnaws the flesh and eats away seeds from watermelon, melon, cucumber, tomato. Field mouse damages the root-crops and zucchini.
All melons are damaged by gophers. Jerboa digs the sowings and eats the germinating seeds of watermelon, melon, cucumber and sunflower. Mole rats and Ellobius, constantly dwelling belowground, may mainly harm the root-crops. Hamsters and Myospalax psilurus Milne-Edwards commonly eat various root vegetables such as beets, turnips, carrots, etc. Field mouse, common hamster, Manchurian Zokor, water voles and great mole rat eat potato leading to yield loss. Vegetable and melon crops are also much harmed by Nesokia indica Gray (11).
In Rajasthan (India) the losses of vegetables from the rodents vary from 4.1 to 19.9 % depending on the crop and are of 8.7 % on average. The major pests are Mus booduqa Gray and Gerbillus gleadowi, at that the tomatoes and eggplants are most harmed (12).
Impact on fruit crops. Rodents eat seeds and fruits, dug seedling from the soil, gnaw the bark and thin twigs. Feeding specialization among rodents differs. Loirs damage nut crops, as well as stone fruits, gnawing out pits and eating flesh of apple (Fig. 2), peaches and apricots, and also grape is often damaged. Forest dormouse eats and damages apples and pears. Voles gnaw the bark and roots, hares gnaw the bark and lower branches in winter, eat the young shoots, and mole rats and Ellobius gnaw roots of fruit and berry crops, causing their weakness.
The fruit yield losses from rodents can be rather significant. In Germany when the number of Microtus arvalis increased, the losses of apple trees production were estimated at € 25 million per year (13). In the East USA the Microtus pennsylvanicus and M. pinetorum, gnawing the bark, damage 5.6 % apple trees, being equal to annual losses from $ 40 million (14) to $ 50 million (15). In hazelnut plantations of Cuneo, Italy, the number of Glis glis ranges from 4.13 to 247 individuals per 1 ha, and in the areas of the highest concentration they consume up to 61 % of the hazelnut crop (16).
Fig. 2. Loir eats the apple (Great Britain). The
animal eats walnuts, chestnuts, berries, fruits such as pears, apples, grapes, cherries, plum, mulberry. In the Northern Caucasus during summer each loir consumes 400 pears. Steven Morris photos, September, 2010.
Impact on other crops. Their list is not limited to grain, vegetable and fruit crops. The Meriones erythrourus Gray significantly damage cotton plants, crunching boxes and husking seeds. Field and wood mouse, as well as gophers actively damage the sunflower crops. Thus, Citellus pygmaeus Pall. gnaw off the upper part of seedlings what makes a young plant to produce a lot of side shoots, and as a result such plants are removed at weeding.
Many rodents are the pests of sugarcane. They feed both on upper parts of the plant and on its roots. They also damage the roots when digging holes, causing plant lodging in the wind. In addition, microorganisms can get the injured stems, thus reducing the sugar content. In India the major pests of sugar cane are Bandicota bengalensis, Tatera indica and Mus musculus. They cause from 8.6 to 12.1 % losses in sugarcane with 31.5 % decrease in weight and 24.5 % decrease in sugar content (17).
Rodents as pests of pastures. In addition to a significant destruction of green mass, rodents alter the qualitative composition of grasses, eating the most valuable forage species. The Rhombomys opimus Licht. is a harmful pest of pastures in the Central Asia and Southern Kazakhstan. These animals eat prostrate summer-cypress, sedge, wheatgrass, astragalus, and thus are a serious competitor to livestock, especially sheep (5).
The following data can illustrate the rodent-related damage to livestock. Thus, Meriones erythrourus Gray in case its number is within an average limits can eat up to 20-30 % of valuable grasses. At gophers’ population density of 30 individuals per 1 ha, the yielded green fodder dry weight may be annually reduced by more than 1125 kg/ha, or by 38 %. Vole population density of 250 individuals per 1 ha is capable of destroying up to 4 % of the annual alfalfa harvest. Marmots eat daily up to 0.45 kg of green fodder, and even more plants they trample when paving their paths. Gophers from North and Central America consume a quarter to a third of the crop of alfalfa (10). In Poland during the outbreaks of common vole Microtus arvalis these animals damage up to 45.8 % of the alfalfa (13). One pika when procuring food can collect plants in haystacks of 20 kg in weight (18).
Damage from rodents and their control. It is obvious that the global damage from pests like rodents is very significant. According to some estimates, they damage or destroy to *Д of agricultural products (19), but these figures are obviously overestimated. The damage is basically rat- and mice-associated. In Asia rats eat annually the food enough to feed 200 million people (20). In 10 counties of the State of California (USA) the annual financial losses of crop from rodents and birds range from $ 168 to 504 million (9).
Technological, mechanical, chemical and biological approaches can be used to prevent losses from rodents.
Technological measures are mostly preventive and restrict animal spreading and reproduction. For instance, in case the yield is completely removed from fields, the rodents in winter are short of food that they need to stay alive and reproduce. Deep plowing which destroys holes and crop rotation also can serve as preventive technologies. Mechanical methods include the extermination of rodents with traps, snares, etc. Poisoned food baits, powdered preparations for dusting burrows and the gaseous toxic substances, mainly used indoors against rats, are the most popular chemical preparations applied. Biomethods include the use of natural enemies of rodents such as cats, dogs, кошек, hedgehogs, ferrets, mongooses and birds of prey, etc.
Other mammals. General characteristics. In most agricultural pests the harmfulness is related to plant consumption as a fodder. In mammals the harmfulness is mainly caused by simple moving through and under the plantings.
The Talpa europaea, when daggering their tunnels, destroy plant roots thus interfere plant nutrition that often results in plant death, also they eat the earthworms valuable for soil fertility. A significant harm is due to crop trampling by large mammals. In general, destroying agricultural plants by wild animals is rather common.
In different regions the list of large animals injuring crops changes significantly. In USA the 53 % of the interviewed farmers indicated Odocoileus spp. being the most harmful, while Procyon lotor and Canis latrans were considered the most problem species by 25 % and 24 % of respondents, respectively (21).
In South China (Yunnan) the major pests are elephants, monkeys, bears, gaurs, deer and wild pigs, at that 90 % losses are due to Elephas maximus (22).
In Africa many animal species cause losses in agriculture. Of them the elephants, baboons, monkeys, hippos, porcupines and bats are the most harmful, and the banana, cocoa, maize, rice and sorghum plantations are most damaged.
In each country the main pests are specific. In some territories of Uganda they are elephants Loxodonta africana which destroy up to 21 % of total yield (23), and in Entebbe suburb green monkeys Cercopithecus aethiops mostly harm the fruit plantations (24). In Zambia Potamochoerus porcus, Loxodonta afri-cana, Papio ursinus, Cercopithecus aethiops) Hippopotamus amphibius and Hystrix cristata are the main harmful mammalians (25).
In the forest area of the temperate zone the problem species are wild boar, bear, and some ungulates. Thus, bears damage the oat fields that they visit as the grain begins to fill, but especially strong impact occurs at the phase of wax ripeness (26). In the remote areas of the Leningrad and Vologda provinces 2-3 bears got into the habit to visit oat crops sometimes completely suck and trample up to 10-15 ha during an autumn season (27). In France crop damage by wild boars and deer in 2007 was estimated at 22-23 million Euros (28).
Sometimes foxes and jackals damage the crops. Finding melon field, they regularly visit it until the end of the harvest, and eat only ripe melons. In some areas these animals consume up to 5-7 % of the crop (29).
In many parts of the globe the dangerous pests include hares, i.e. Lepus europaeus, L. timidus, L. tolai and L. mandshuricus. Hares eat sunflower, buckwheat, cereals, vegetables and melons, they also can chew the bark of 10-15 apple and pear trees during a night. The most serious problems are caused by hares in Argentina, Australia, and to a lesser extent in North America (30).
Economic damage from wild mammals. Evaluations of economic damage due to them are few, and those reported are not reliable as often based just on the words of the victims. In the United States in 1992 each of the surveyed farmers spent an average of 43.6 hours and 1002 dollar, trying to stop the damage from wildlife or prevent it (18). Throughout the country only in 1989 the wildlife-induced crop damage amounted $ 343 million. The main part of the losses ($ 247 million) occurred in field crops, $ 53 million lost resulted from the damaged vegetables, fruits and nuts, and another $ 16 million loss was related to other agricultural crops (31).
P.D. Curtis (22) estimates the annual crop losses from wild animals in USA at $ 500 million. The total losses, including livestock husbandry, exceeded $ 1 billion (32). In Xishuangbanna of Yunnan, China, in 1994 the losses from wild animals in agriculture reached 4 million yuans, being equal to about $ 482 thousand (22).
Indian elephant as a harmful species. These animals are the most harmful pests among mammals. About 20 % of the world’s population presently lives in the elephants’ area or near the places of their habitat. In most areas where the elephants are spread they greatly harm the crops, mainly rice, corn, bananas and
Fig. 3. Canadian geese on a wheat field in Colorado (USA). They are not priority pests, but eat both young seedlings and grain (http://lib.colostate.edu/research/agmc/crops.html).
green peppers (22).
Just trampling can cause significant losses. In Salakpra of Thailand in 2006 there were registered 462 invasions of elephants to farmers’ fields (33). Elephants also mark trees and bushes, and sometimes they knocked them to demonstrate or test the power or for emotional release.
Very big losses, an average 1,121 billion Rs, or $ 11,928 million
I—’яд are due to elephants in Sri Lanka (34).
The P*antat'ons arc niost attacked in ШШНММШ») the southem regions, where an average
loss during vegetation is 12049 Rs per each farmer, or $ 128, that is about a third of earn. Besides, most farmers, up to 70 %, should spend significant money to protect their yield. Some of them cultivate less valuable crops, such as sweet potato and cassava, at the edges of fields to reduce the damage of valuable crops, and some use unfixed dates for seeding and harvesting in the view not to lose the whole yield at an overnight raid of elephants. Another way to protect crops is using plants rejected by elephants. In the areas of the most violent conflict the peasants simply leave the arable land because the tries to grow crops are obviously senseless (35).
Birds as pests. This problem is known for a very long time. The study of frescoes and paintings on ancient Greek and Egyptian vases shows that even then man suffered from an attack of birds on vineyards and orchards. The main damage from birds is due to their food-getting activity, which leads to losses of agricultural and raw materials at all stages of growth, primary processing, storage, transportation and industrial use. Herbivorous and omnivorous birds cause damage to grain (Fig. 3), fruit, vegetables, and seed production, and also to plant breeding (36).
The use of those or other plants is determined by taxonomic position and the ability to find suitable feed. Thus, the Fringillidae birds such as finches, siskins, goldfinches, crossbills, etc., and Ploceidae, namely sparrows, fanciscanus, etc., cause the extensive damage to agriculture in the southern regions of the European Russia, Ukraine, Moldova, Kazakhstan and in the Central Asia, eating seeds of sunflower, cannabis, millet, and wheat (10).
In Krasnodar Krai the rooks and other corvids, starting with the spring time, hatch out of the ground the just sown seeds of sunflower, soybeans, and later damage their seedlings by pulling young plants or biting their appeared cotyledons (37). In the state of North Dakota (USA) the sunflower and corn crop losses from birds were 1.2-3.0 % (38).
A threat from some species can be great. Thus, the population of Quelea quelea from Africa is the biggest. These birds form migrating colonies, each being up to 30 million individuals in number. They eat sorghum, wheat, barley, rice, sunflower and maize. A colony of 2 million individuals can consume 50 tons of grain per day, for which they are sometimes called feathered locust (39). In Scotland up to 25 % of oat and 20 % of barley are eaten by rooks. In USA an average grain losses from Agelaius phoeniceus is 16.2 % (40). Annual grain
losses of 60 ton from Grus grus L. are reported by Yu.M. Markin in the European Russia (41).
Significant damage to vineyards in Southern Europe and North Africa, up to a third of the harvest, is caused by birds, mostly pink starlings and common starlings (42). Stone fruit trees such as cherries, plums, apricots, etc., are suffered from these representatives of the avifauna. In Uzbekistan the range of grape pests is much wider and includes Turkestan starlings, common myna, several species of sparrows, crows and magpies. According to A. Dzhabarov (43), from 7.0 до 23.2 % of grape yield is damaged in the southern-western Uzbekistan. Birds spoil the best berries, and the grapes lose the marketable condition. Woodpeckers, starlings, magpies, and fieldfare peck different kinds of berries, the damage to strawberry is particularly widespread. In central Russia pecking soft apples is typical.
In Ferrara province, the Northern Italia, pheasant is most economically important pest bird, damaging crops and vegetables. Starlings and sparrows cause significant damage to fruit and grapes. Magpies damage melons, watermelons and melons. Wild pigeons and ducks consume forage grasses (44).
Economic losses caused by birds on crops. Damage from birds is quite large. For example, in Australia the annual losses only in gardening are $ 300 billion (42). In this country there are more than 60 species of birds, damaging horticultural crops (Fig. 4). In Africa, the damage to crops only from Quelea quelea is $ 70 million per year (39), including $ 6.3 million in Sudan and about $ 1 million in Somalia (45). The annual cost of the vineyard invasions of common and pink starlings only in Tunisia amounts 8-10 million DM (42).
Over time the species composition of bird pests can vary, sometimes dramatically. For example, in Germany in the late 1970s the greatest damage was due to starlings (10 million DM), blackbird (2.4 million DM), wood pigeon (2 million DM), and rook (0.1 million DM). In the early 1990s wild wintering ducks and geese (42 million DM), wood pigeon (1 million DM) and corvids such as crows, jackdaws, rooks, magpies, etc. (0.5 million DM) became the most dangerous (46).
In conclusion it should be emphasized that the financial damage from mammals and birds is still very significant. For example, in the United States in 2001 it amounted to $ 619 million for field crops and $ 146 million for the fruit and nut crops (47).
Thus, despite the consequences of the diseases and invasion of insects for crop and forage production are commonly discussed, the damage from mammals and birds is much greater than, for example, the losses inflicted by nematodes, mites and slugs, although much less than those caused by insect pests. In general, the damage caused by mammals and birds as agricultural pests is gradually reduced, however, remaining still high. The reasons lie in the application of modern scientific and engineering developments such as new harvest technology, the measures for plant protection, etc., and also in reduction of wildlife populations due to the limitations of their natural habitat and deterioration of environmental conditions. Among the animals the rodents still are a priority group of
Fig. 4. Young starling pecks pear (New South Wales, Australia). Starlings are among the most harmful birds, they are most dangerous for gardening (eat grapes, cherry, plums, cherries, apricots, apples, etc.). Photo: B. Lukins. January 30, 2004.
agricultural pests, but significant damage is caused by other species. Their sets vary depending on the specificity of regional conditions and cultivated crops.
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