Natural enemies in cotton

A field trial was conducted to evaluate the bioefficacy of combinations of spinetoram 12 SC with fungicides / fertilizer / growth regulator, as foliar application on 90 days old Bt cotton against sucking pests and foliar diseases.

7p quenchua8 29-09-2020 18 1   Download

In this background, experiments were designed to know the compatibility of a newer insecticide, diafenthiuron 50 WP with other agrochemicals against sucking pests, foliar diseases and natural enemies on Bt cotton.

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Cyantraniliprole 10% OD at 90 g a.i.ha-1 was significantly effective when sprayed twice at 15 days interval, minimized the sucking pests population and increased cotton kapas yield. Cyantraniliprole 10% OD treatments at 90, 180 and 320 g a.i. ha-1 concentrations had not caused any phytotoxic effects like injury to leaf tip, leaf surface, wilting, vein clearing, necrosis, epinasty and hyponasty. Cyantraniliprole 10% (w/v) OD showed the least effect against the spiders.

13p nguaconbaynhay6 24-06-2020 9 1   Download

Survival and fertility characteristics of the third instar larvae of Spodoptera litura (Fabricius), on Bt-I and Bt-II cotton hybrids during 120-150 DAS were assessed in the laboratory. Life tables and population parameters of the S.litura were constructed in an environment with unlimited food supply and that was free of natural enemies. The results revealed that the modest rate of mortality occurred in the immature stage, especially in the third instar. The population parameters calculated are recorded as low in Bt-II hybrids compared to Bt-I hybrids.

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The study on “Incidence of sucking pests and natural enemies in cotton under high density planting system (HDPS)” was conducted at RARS, Lam, Guntur during kharif, 2016-17 to observe the incidence of sucking pests such as leafhoppers, aphids, thrips and whitefly and also the incidence of natural enemies (Spiders and Coccinellids). Among the sucking pests thrips population was found dominating other sucking pests during initial days of crop growth period i.e., up to 90 DAS there after aphid population was dominated i.e., from 90- 135 DAS both in normal and HDPS.

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The main aim of the study was to reduce the maximum use of pesticides, these pesticides increases pest resurgence, environmental pollution and toxic residue in food. Efforts were being made to encourage those pest management practices which are ecofriendly. Pooled mean of both the years during 2016 and 2017 revealed that minimum population of leafhopper nymphs was recorded in cotton intercropped with bajra as border crop (2.47 nymphs/leaf) and maximum population was recorded in sole cotton (3.54 nymphs/leaf).

9p nguathienthan4 18-04-2020 18 1   Download

To manage the population of cotton whitefly (Bemisia tabaci), an experiment was laid out in randomised block design (RBD) with nine treatments including untreated control and each treatment was replicated thrice.

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In order to study the effects of repeated use of various insecticides on thrips and their natural enemies viz., Ladybird beetle and Predatory spiders, an experiment was conducted during Kharif, 2018-19at the Experimental farm, Department of Agricultural Entomology, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani. The insecticides selected included those used commonly among the farmers viz., Imidacloprid 17.

13p cothumenhmong3 22-02-2020 17 0   Download

An experiment was conducted during kharif season 2015-2016 at experimental field, Department of Entomology, Live Stock Farm, Adhartal, Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur (M.P.), to observe the “Succession of Insect Pest Complex and Their Natural Enemies in Pigeonpea [Cajanus Cajan (L) Millsp.]”. Result revealed that 17 species of insects (13 pest and 4 natural enemies) were observed in pigeonpea i.e. Jassids Empoasca fabae Harris, Cow bug Otinotus oneratus W., Pod bug Clavigralla gibbosa Spinola, Riptortus sp.

10p trinhthamhodang3 12-02-2020 13 0   Download