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Muminov Ruho Dalabaevna, Tashkent State Agrarian University Assistant of Professor of Deportment Plan protection
from Pest and quarantine. Mamatov Kamol Shavqievich, Docent, Head of Laboratory, Research Institute of Plant Protection.
Jumaev Rasul Axmatovich, Tashkent State Agrarian University. Ph D., of Deportment Plan protection from Pest and quarantine E-mail: rasul-jumaev@mail.ru; jumaevrasul1990@gmail.com,
THE DEVELOPMENT OF RUSSET MITE IN VARIOUS PLANTS AND EFFECTIVENESS OF PESTICIDE
Abstract: the level of development of russet mite in various plants and the amount of insecta-caricide used for these pests and their biological efficacy has been studied. Moreover, based on these result, recommendation have been made for commercial grower.
Keywords: plants, host plants, Aculops lycopersici, biological efficacy.
One of the main problem nowadays is to provide the population of our country with quality products of vegetables. Among other agricultural crops, pests and diseases impacte tomato crop yield severe. In recent years, tomatoe production yield lost attributed to russet mite (Aculops lycopersici Massee) damage in Uzbekistan.
The russet mite dameges many plant during its all life satges except egg phase. We conducted experiments to detect different levels ofrusset mite damage in various plants. Damaged plants were observed every 3 days. In some plants, the development of russet mite is slow that others where russet mite reproduce on stem rather than on the leafofthe plant. Monitoring results are shown in (Table 1).
Russet mite damage was observed on stems and leaves of Solanaceous plants. The pest movies upword on the plant until the plant dies. In the potatoes (Solanum tuberosum L.) plant turns in to light bronze color and deformities unevenly, where plant leaves drys and the plant dies just like in tomatoes.
Black nightshade (Solanum nigrum L.) is more susceptible to the russet mite damage. Pest completes more life cycle than on tomato. Moreover, the pest fecundity was higher in black nightshade plant than on tomato plant. Eggplant (Solanum melongena L.) is also considered a very good host for russet mite. The russet mite reproduces very
good on eggplant as a result the plant leaves turn in to yellow color and eventually plant dies. On tomatillo (Physalis ixocarpa) the pest develops rapidly on the both side of the leaf. As a result, both side of the leaf turn in to yellow color and it starts drop out from the stem. This symptom might be due to the damage of the leaf trichomes. There was a moderate development of the russet mite on field bindweed (Convolvulus arvensis). In other plants no development of russet mite was observed.
The biological effectiveness of chemicals on tomato plant growth in 2016-2017 was rising in "Sevara Brend Tayr" farmer, Qibray district of Tashkent region. Experiment was conducted base on Sh. T. Hodjaev (2004). To calculate the amount of russet mite, samples were taken from a middle of tomatoes. Ten samples were taken from each treatment 10. One leaf was selected for observation from infested plant. The amount of russet mite was counted on one life. The observations were made on plants day one, three, seven, and 14 days after acaricide was applied. The efficacy of the chemical control estimated using the Abbot's (1925) formula. Look for table 2 for results.
Rainbee Effectum Duo, 40% clarity. (0.2 l/ha), Neomectin, 3.6% k.e. (0.15 l/ha), Benthos, 1.8% k.e. (0.5 l/ha), column, 50% p.p. (1.0 l/ha) Vertimek, 1.8%
Section 1. Biology
k.e. (standard) pesticides have been tested. It was found Therefore, these pesticides are considered to be an ef-
that the above-mentioned pesticides have a biological fective way of controlling when they are used mentioned efficacy from 86% to 94%. amount in above.
Table 1. - Host plants of russet mite (2016-2017 years)
№ The scientific name of the plant Common name of plant Damage rate
1. Lycopersicum esculentum Mill. Tomato +++
2. Physalus ixocarpa Mill. Tomatillo +++
3. Solanum tuberosum L. Potato +++
4. Solanum dulcamara L. Red nightshade ++
5. Solanum nigrum L. Black nightshade +++
6. Convolvulus arvense Field bindweed ++
7. Capsicum annuum L. Hote red pepper +
8. Nicotiana tabacum L. Tobacco 0
9. Nicotiana longifolia L. Long leaf tobacco 0
10. Brassica oleraceae L. Cabbage 0
11. Petroselinum cricpum L. Parsley 0
12. Doucus carota L. Carrot 0
13. Cucumis sativa L. Cucamber +
14. Mello sativa Duch. Melon +
15. Solanum melongena L. Eggplant ++
16. Cucurbita maxima Duch. Squash 0
17. Gossypium hirsutum L. Cotton 0
Explanation. 0 - Russet mite cannot reproduce. + - hope does not show symptom;
++ - host plant attracts the russet mite, host plant shows severe damge and sometimes host palnt dies; +++ - Russet mite reproduce fast and feed well, the plant loses most of its yield.
Table 2. - Efficiency of pesticide in tomatoes in the field experience farmer. "Sevara Brend Tayr" Kibray district work fluid 300 l/ha, 2017
Treatment Application, l/h^ Active agent Numbers of russet mite on tomato stem. Biological efficacy, days,%
after application Da ys after application
1 3 7 14 1 3 7 14
Effectum-Duo, 40% c.e. 0.2 lambda-cyh-alothrin + imidacloprid 37.5 4.5 3.3 1.7 3.0 88.5 92.2 96.1 93.5
Neomektin, 3,6% c.e. 0.15 Abamectin 40.1 5.2 4.3 4.0 6.7 87.6 90.5 91.4 86.4
Benthos, 1,8% c.e. 0.5 Abamectin. 1.8% EC 38.2 4.2 3.0 1.5 2.8 89.5 93.1 96.6 94.0
Colo, 50% p.s. 1.0 Diafenthi-uron 35.9 4.3 3.2 2.0 2.3 88.6 92.1 95.2 94.8
Vertimek, 1,8% c.t. (etalon) 0.2 Abamectin 35.4 3.1 2.5 2.2 3.9 91.6 93.8 94.6 91.0
Control (water) - - 34.6 36.2 39.5 40.2 42.4 - - - -
HCP,
05
3.4
References:
1. Hodjaev Sh. T. Basic requirements for small and large-scale experiments of insecticide test in agricultural crops. A set of methodological guidelines for testing insecticides, acaricides, biologically active substances and fungicides.- Tashkent. Uzinformagroprom.- 1994.- P. 4-18.
2. Abbots W.S. A method of computing the effectiveness of insecticide, - 1925.- V. 18.- № 3. - P. 265-267.
