SEASONAL OCCURRENCE AND MANAGEMENT OF MAJOR INSECT PESTS OF SOYBEAN.
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Date
2019-07-22
Authors
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Publisher
Dr. Punjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra.
Abstract
The present study entitled, “Seasonal occurrence and management of major insect pests of soybean” was undertaken incorporating nine treatments (which includes botanicals also) consisting of neem oil @ 2% (T1), neem seed extract (NSE) @ 5% (T2), quinalphos 25 EC @ 0.05% (T3), fenvalerate 20 EC @ 0.01% (T4), emamectin benzoate 5 SG @ 0.02 % (T5), indoxacarb 15.8 EC @ 0.01% (T6), spinosad 45 SC @ 0.01% (T7) and control (water spray) (T8) against major insect pests on soybean i.e. tobacco leaf eating caterpillar, green semilooper, girdle beetle and stem fly. The average population of major insect pests on soybean was observed at 3, 7 and 14 days after each spray application. The experiment was laid out in RBD during Kharif 2018. The efforts were made to correlate the incidence of different insect pests with abiotic factors in a separate experimental plot of 5 X 5 m2.
The results revealed that, green semilooper Thysanoplusia orchalcea Walker, tobacco caterpillar Spodoptera litura Fabricius, Stem fly Melanagromyza sojae Zehntner and girdle beetle Obereopsis bravis were the main pests which damaged the crop. The incidence of semilooper and tobacco caterpillar initiated in 29th and 30th MW respectively and its peak incidence was in 34th and 35rd MW respectively. Incidence of stem fly and girdle beetle initiated from 29nd and 32th MW respectively and its peak period was in 39st MW. The correlation analysis results revealed that, incidence of girdle beetle was significant and positively correlated with maximum temperature (0.751*) and highly significant and positively correlated with minimum temperature (0.721**) and. Stem fly infestation non-significant and positively correlated with maximum temperature (0.601*) and highly significant and positively correlated with minimum temperature (0.642**). Minimum cumulative mean number of tobacco caterpillar were recorded at 3, 7 and 14 DAT in the treatment of spinosad 45 SC @ 0.01% (0.13, 0.07 and 0.06 larvae/mrl)was found to be very effective treatment followed by the treatments of fenvalerate 20 EC @ 0.01% (0.13, 0.10 and 0.06 larvae/mrl), emamectin benzoate 5 SG @ 0.02% (0.21, 0.15 and 0.10 larvae/mrl), indoxacarb 15.8EC @ 0.01% (0.23, 0.18 and 0.13 larvae/mrl), quinalphos 25 EC @ 0.05% (0.46, 0.38 and 0.33 larvae/mrl), neem oil 2%(0.97, 1.06 and 1.19 larvae/mrl), neem seed extract (NSE) @ 5% (1.02, 1.11 and 1.26 larvae/mrl) and control (1.34, 1.52 and 1.63 larvae/mrl).
Minimum cumulative mean number of green semilooper were recorded at 3, 7 and 14 DAT in the treatment of emamectin benzoate 5 SG @ 0.02% (0.10, 0.07 and 0.06 larvae/mrl) was found to be very effective treatment followed by the treatments of fenvalerate 20 EC @ 0.01% (0.13, 0.09 and 0.03 larvae/mrl), spinosad 45 SC 0.01% (0.13, 0.09 and 0.08 larvae/mrl), indoxacarb 15.8 EC @ 0.01% (0.39, 0.20 and 0.14 larvae/mrl), quinalphos 25 EC @ 0.05% (0.39, 0.36 and 0.35 larvae/mrl), neem oil 2% (0.74, 0.80 and 0.90 larvae/mrl), neem seed extract (NSE) @ 5% (0.81, 0.92 and 1.07 larvae/mrl) and control (1.02, 1.16 and 1.38 larvae/mrl). Minimum cumulative mean per cent foliage damage due to tobacco caterpillar and green semilooper were recorded at 3, 7 and 14 DAT in the treatment of fenvalerate 20 EC @ 0.01% (1.04, 0.74 and 0.67%) was found to be very effective treatment followed by the treatments of spinosad 45 SC 0.01%. (1.11, 0.90 and 0.84%), emamectin benzoate 5 SG @ 0.02% (1.26; 1.03 and 0.99%), indoxacarb 15.8 EC @ 0.01% (1.30, 1.15 and 1.08%), quinalphos 25 EC @ 0.05% (6.12, 6.68 and 7.19%), neem oil 2% (6.50, 7.61 and 7.93%), neem seed extract (NSE) @ 5% (6.86, 7.93 and 8.37 %) and control (9.32, 11.38 and 12.56%).
Minimum cumulative mean per cent infestation of girdle beetle was recorded at 3, 7 and 14 DAT in the treatment of spinosad 45 SC 0.01%. (4.15, 4.28 and 4.42%) was found to be very effective treatment followed by the treatments of emamectin benzoate 5 SG @ 0.02% (4.45, 4.58 and 4.67%), fenvalerate 20 EC @ 0.01% (5.12, 4.51 and 4.60%), indoxacarb 15.8 EC @ 0.01% (4.90, 5.04 and 5.26%), quinalphos 25 EC @ 0.05% (5.05, 5.10 and 5.26%), neem oil 2%(5.75, 5.94 and 5.91%), neem seed extract (NSE) @ 5% (6.68, 6.80 and 6.80%) and control (14.21, 14.20 and 14.20%). Minimum cumulative mean per cent infestation and tunneling at physiological maturity due to stem fly were recorded after three sprays in the treatment of spinosad 45 SC @ 0.01% (T7:37.10% infestation and 8.15% tunnel/5plants) was found to be very effective treatment followed by the treatments of fenvalerate 20 EC @0.01% (T4:38.00% infestation and 9.10% tunnel/5plants), emamectin benzoate 5 SG @ 0.02% (T5:39.10% infestation and 8.20% tunnel/5plants), indoxacarb 15.8 EC @ 0.01% (T6:45.23% infestation and 10.02% tunnel/5plants), quinalphos 25 EC @ 0.05% (T3:47.20% infestation and 11.05% tunnel/5plants), neem oil @ 2% (T1:50.75% infestation and 12.00% tunnel/5plants) and neem seed extract (NSE) @ 5 per cent (T2:54.95% infestation and 12.20% tunnel/5plants) and control (T8:61.20% infestation and 15.60% tunnel/5plants). The treatment with spinosad 45 SC @ 0.01% recorded maximum yield and the highest ICBR was recorded in the treatment of fenvalerate 20 EC 0.01%. The other treatments in descending order in respect to yield were T7> T4> T5> T6> T3> T1> T2 and in respect to ICBR were T4>T7> T3> T6> T5> T2> T1.
Description
It relates to effective control of the major insect pests of soybean by fenevalerate and spinosad and also enhanced yield in soybean crop.
Keywords
Chemical control, Insecticides, Glycine max.
Citation
RAUT, ASHISH RAMKRUSHNA. (2019). Seasonal occurrence and management of major insect pests of soybean. Department of agricultural entomology,Nagpur. Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Sc. 2019. Print. xiv, 124p. (Unpublished).