Abstract
Brinjal is susceptible to attack of various insect pests from seedling to fruiting stage. Among these, brinjal shoot and fruit borer, Leucinodes orbonalis (Guen.) is the most destructive pest and is considered to be the limiting factor in quantitative as well asqualitative harvest of brinjal fruits. In the present study, efficacy of some new insecticides viz. Pine 6 WG (Emamectin benzoate + Abamectin), Heron 5 EC (Lufenuron), Belt 24 WG (Flubendiamide) and Cyclone 2.5 EC (Lambda-cyhalothrin) were evaluated against brinjal shoot and fruit borer (BSFB) in field condition from the period of October, 2015 to April, 2016. The experiment was laid out in a Randomized Complete Block Design (RCBD) having three replications and two concentrations of each of the insecticides. A total of three spraying was given and finally a cumulative mean was found out. Data were collected on percent shoot infestation, percent fruit infestation, marketable fruit yield (t/ha) and abundances of natural enemies per plant. Results clearly showed that all the insecticides significantly reduced BSFB infestation as well as increased marketable fruit yield compared to the untreated control. The highest shoot (27.40%) and fruit (55.93%) infestation were recorded from control plots. On the other hand, the lowest shoot (6.71%) and fruit (11.58%) infestation were recorded from Pine 6 WG treated plots @ 0.50 g/L that was followed by Heron 5 EC @ 1.0 ml/L (6.89% shoot; 14.51% fruits), Cyclone 2.5 EC @ 1.5 ml/L (15.73% shoot and 16.45% fruits) and Belt 24 WG @ 0.50 g/L (9.53% shoot and 25.47% fruits), respectively. Similar trend was found in case of marketable fruit yield as well. Pine 6 WG and Heron 5 EC were found to be comparatively safe for both ladybird beetle and lynx spiders as their abundances were not changed significantly compared to untreated control. In contrast, the application of Belt 24 WG and Cyclone 2.5 EC has reduced 50 to 60% of the ladybird beetle and lynx spiders populations in brinjal eco-system. The results suggested that two biopesticides viz., Pine 6 WG and Heron 5 EC can be used successfully against BSFB considering minimum shoot and fruit infestation, higher fruit yield and less toxicity to natural enemies in brinjal eco-system.
 J Bangladesh Agril Univ 17(3): 319–324, 2019
Highlights
Brinjal is one of the important solanaceous year-round vegetable crops cultivated widely throughout Bangladesh and covers about 15% of the total vegetable cultivation area of the country (Rahman, 2005)
The results suggested that two biopesticides viz., Pine 6 WG and Heron 5 EC can be used successfully against brinjal shoot and fruit borer (BSFB) considering minimum shoot and fruit infestation, higher fruit yield and less toxicity to natural enemies in brinjal eco-system
The percentage of shoot infestation was significantly (P
Summary
Brinjal is one of the important solanaceous year-round vegetable crops cultivated widely throughout Bangladesh and covers about 15% of the total vegetable cultivation area of the country (Rahman, 2005). In Bangladesh, it is the second most important vegetable crop after potato in relation to its total production. It is used as a raw material in pickle making and as an excellent remedy for those suffering from liver complaints. In Bangladesh, about eight insect species are considered as major pests causing damage to brinjal (Datta et al, 2011) Among these insect pests, brinjal shoot and fruit borer, Leucinodes orbonalis Guenee is the most notorious (Latif et al, 2010) and destructive one. In vegetative stage of the crop growth, Cite this article
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