M. L. Chatterjee

Bio: M. L. Chatterjee is an academic researcher. The author has contributed to research in topics: Aphid & Acetamiprid. The author has an hindex of 1, co-authored 1 publications receiving 17 citations.

Bio-efficacy of neonicotinoids against Aphis gossypii Glover of okra.

Abstract: An experiment was conducted to observe the efficacy of some neonicotinoidsagainst aphid of okra during pre- kharif season of 2010 and 2011 at Instructional Farm , Bidhan Chandra Krishi Viswavidyalaya. Imidacloprid 17.8 SL@ 50 g a.i. ha -1 was found as a most effective neonicotinoid insecticide against aphid. It recorded least aphid infestation and 84.54 % reduction of population over control. To control aphid populationof okra the other two neonicotinoidsviz., thiamethoxam25WG @ 50 g a.i. ha -1 and acetamiprid 20SP @ 40 g a.i. ha -1 were also found at par with imidacloprid and showed better result than acephate 75WP and dimethoate 30EC. Considering incremental cost ben efit ratio acetamiprid 20SP @ 40g a.i. ha -1 was found most economic over other neonicotinoids . None of the neonicotinoids haveadverse effect on natural enemies of aphid in okra ecosystem.

Role of neonicotinoids in insect pest management: A review

Abstract: Neonicotinoids are the most widely used insecticides in the world. They are systemic in action, travelling through plant tissues and protecting all parts of the crop, and are widely applied as seed dressings. Neonicotinoids are registered globally in more than 120 countries and found to be effective against sucking pests. In terms of area treated almost 90% of the use is as seed treatments. Some of these active substances are approved for use as seed treatments (clothianidin), some as foliar applications (acetimiprid and thiacloprid) and some for both (imidacloprid and thiamethoxam). They are nicotinic acetylcholine receptor agonists; they bind strongly to nicotinic acetylcholine receptors (nAChRs) in the central nervous system of insects, causing nervous stimulation at low concentrations, but receptor blockage, paralysis and death at higher concentrations. Neonicotinoids bind more strongly to insect nAChRs than to those of vertebrates, so they are selectively more toxic to insects; and present no hazard to mammals; they provide effective pest control and have numerous uses in arable farming and horticulture. They provide an alternative mode of action to organophosphate, carbamates and pyrethroid insecticides. This allows them to play a key role in helping to prevent the buildup of resistance in the pests concerned. These show higher efficacy and used at a lower dosage as compared to other conventional insecticides. There is absence of cross-resistance in neonicotinoids with pyrethroids, carbamates, organophosphates and organochlorines.

Comparative efficacy of neem oil and lambdacyhalothrin against whitefly (Bemesia tabaci) and jassid (Amrasca Devastans Dist.) in okra field

Abstract: The present study was conducted to investigate the comparative efficacy of neem leaf extracts and lambdacyhalothrin against whitefly and jassid in okra field. Four okra cultivars (SABZ PARI, SADA BAHAR, PUS A SAWANI, ARKA and ANAMIKA) were grown in field with four replication. Five neem oil concentrations (1, 2, 3, 4 and 5 percent) and a synthetic insecticide (Lambdacyhalothrin 2.5EC) @ 330 mL acre−1 were applied to evaluate efficacy effects on targeted insects population. Distilled water was used as control. The plots treated with synthetic insecticide and the leaf extracts against targeted pests had significantly (P > 0.05) suppressed insect population as compared to control. After 1st spray, no significant (P > 0.05) reduction in pest populations were observed after 24 hours. However, significant (P 0.05) impact on yield parameter (yield). We conclude that Lambdacyhalothrin and neem oil @ 4 and 5% concentration are equally effective in controlling jassid and have same impact on yield of okra plant.

Management of major insect pests of black gram under dryland conditions

Abstract: Field experiments were conducted during rabi 2011 and 2013 to evaluate the efficacy of different insecticidal treatments against aphid, Aphis craccivora Koch, leafhopper, Empoasca kerri Pruthi, defoliator, Spodoptera litura (Fab.) and pod borer, Helicoverpa armigera (Hub.) on black gram. The results showed that seed treatment with thiamethoxam 25 WG @ 3 g/ kg of seed + spray with thiamethoxam 25 WG @ 0.4 g/ l recorded the lowest population of aphids (1.60, 1.45 no. /plant) and leafhoppers (2.36, 2.12 no./ plant) followed by spraying of imidacloprid 17.8 SL @ 0.4 ml/ l with 83.96, 87.45 kg and 66.13, 71.61 per cent reduction over control, respectively after second round of spraying in the fields trials I and II. Indoxacarb 14.5 SC @ 1 ml/ l provided an effective control of S. litura and H. armigera which recorded 0.04, 0.00 and 0.09, 0.03 nos of larvae/plant at 7th day after the second application in the field trial I and II, respectively, which was at par, with sponsored 45 SC @ 0.4 ml/ l (0.08, 0.07 and 0.13, 0.13 at 7 DAT of second application) but was significantly better than the untreated control. Thus, seed treatment with thiamethoxam 25 WG @ 3 g/kg of seed + spray with thiamethoxam 25 WG @ 0.4 g/ l and indoxacarb 14.5 SC @ 1 ml/ l proved effective against sucking pests and borers of black gram, respectively and can be recommended for their use in black gram ecosystem.

Effect of different doses of newer insecticides against sucking pests of okra

Abstract: Field experiment was conducted to evaluate and validate the efficacy of some new insecticides against sucking insect pest’s viz., leafhopper, aphid and whitefly in okra. Three sprays of different insecticides viz., Thiamethoxam 25 WG, Lambda cyhalothrin 5 EC and Triazophos 40 EC, at three different concentrations of Thiamethoxam 25 WG, Lambda cyhalothrin 5 EC and Triazophos 40 ECwere made at 15 days interval. This study revealed that, amongst the treatments tested, the cumulative effect of foliar spray of Thiamethoxam 25 WG @ 0.006% was found the most effective against aphids, followed by Lambda cyhalothrin 5 EC @ 0.004%. While, Thiamethoxam 25 WG @ 0.006% was effective against leafhoppers population followed by Thiamethoxam 25 WG @ 0.008%. Also, in case of whitefly the effective treatment recorded was Thiamethoxam 25 WG @ 0.006%. The recommended doses of insecticides were found more effective than other doses.

Bio-Efficacy of insecticides against sucking pests; Jassid and Thrips infesting tomato

Abstract: The field experiment was carried out to study the bio-efficacy of different insecticides against sucking pests; whitefly and aphid infesting tomato at instructional farm, College of Agriculture, Junagadh Agricultural University, Junagadh-Gujarat during the prevailing year 2017. The results from the three sprays on whitefly have revealed that imidacloprid 0.005 per cent, difenthiuron 0.05per cent, acetamiprid 0.008 per cent and thiacloprid 0.024 per cent were found to be the most effective insecticides. The results of relative efficacy of nine different insecticides against aphid have revealed that flonicamid 0.015 per cent, imidacloprid 0.005 per cent, clothianidin 0.025 per cent and dimethoate 0.03 per cent gave very good results against aphid. The highest cost benefit ratio (1:77.51) was obtained from the treatment of imidacloprid 0.005 followed by acetamiprid 0.008 per cent (1:74.83), dimethoate 0.03 per cent (1:74.06) and flonicamid 0.015 per cent (1:26.80). Other insecticides register lower yield and economic. Significantly higher yield of 15278 kg/ ha was recorded from plots protected against the sucking pests of tomato while yield of 11620 kg/ ha was recorded from the unprotected plots. The increase in yield in protected plots over unprotected plots was found to