Evaluation of novel insecticides against diamondback moth and natural enemies in cabbage ecosystem

Abstract

Aim: Methodology:Results: I n t e r p r e t a t i o n :Insect pest infestation is the major limiting factors for commercial cultivation of cabbage. Diamondback moth (DBM) is the most notorious insect pest responsible for yield loss of cabbage in most of the cases. The objective of the present study was to evaluate some new insecticides having different novel mode of action against this pest.Field experiments were conducted at C-Block Farm, Bidhan Chandra Krishi Viswavidyalaya (BCKV), West Bengal, India during 2011-12 to 2013-14. The field experiments were laid out in randomized block design comprising eight treatments including control with three replications. The treatments . pyridalyl 10 EC, indoxacarb 14.5 SC, chlorfenapyr 10 SC and chlorpyriphos 20 EC were applied twice at fifteen days interval. Pre-treatment counts of DBM larvae were recorded from randomly selected 5 tagged plants/plot, and subsequently post treatment observations were recorded on 1, 7 and 14 days after each spraying. Coccinellid complex and spiders were recorded during each observation after spraying. Healthy cabbages (weight basis) were recorded separately from each replication for yield data.Chlorfenapyr @ 200 g a.i. ha was effective in reducing mean larval population of d (1.21 larvae per plant) with 85.81 % reduction over untreated control. Next best treatment was pyridalyl @ 150 g a.i. ha with 82.71% reduction followed by indoxacarb @ 150 g a.i. ha (78.44% reduction). Recommended doses of pyridalyl (75 g a.i. ha ), indoxacarb (75 g a.i. ha ) and chlorfenapyr (100 g a.i. ha ) were also found to be effective treatments in reducing the larval population of diamondback moth. Highest costbenefit ratio (1:10.94) w a s r e c o r d e d i n p y r i d a l y l a t recommended dose (75 g a.i. ha ) followed by chlorpyriphos @250 g a.i. ha (1:10.90).Chlorfenapyr, pyridalyl and indoxacrb were found to be effective insecticides against diamondback moth. P y r i d a l y l a n d indoxacarb were found to be relatively safe insecticides towards coccinellid beetles and spider population in cabbage ecosystem.

Toxicity of Some Insecticides to The Fall Army Worm <i>Spodoptera frugiperda</i>

“…Dhawan et al (2007) reported that novaluron was found effective against S. litura with an LC 50 value of 0.0020%. At 72 HAT the LC 50 value of novaluron + indoxacarb was 31.7 ppm and which is in agreement with the results of Patra et al (2015) who evaluated the toxicity of novaluron + indoxacarb against third instar larvae of P. xylostella. Dhawan et al (2007) found that the toxicity (LC 50 ) of flubendiamide was 0.0040% against S. litura, whereas Table 1.…”

Avian Diversity and its Associated Threats in Gharo Creek, District Thatta, Sindh, Pakistan

“…Our results showed that insecticides viz., chlorpyriphos, deltamethrin, flubendiamide and lambda-cyhalothrin were less effective in controlling the larval DBM and CB population in cabbage. Similarly, field trials conducted by Patra et al (2017) revealed that chlorpyriphos was least effective against DBM in comparison to the novel molecules. Spinetoram showed highest efficacy in managing of DBM and CB with higher safety to natural enemies and without any visual symptoms of phytotoxicity (Fig.…”

Population Dynamics of Mustard Aphid, Lipaphis erysimi (Kaltenbach) on Cauliflower in Relation to Biotic and Abiotic Factors

“…[7] The current findings are in accordance with those of Vakaria and Patel [25] and Sharma et al [26] who were reported the incidence of ladybird beetle started from the first week of December and the peak population of ladybird beetle from the third week of February and supports the present results. Patra et al [11], Dwivedi et al [14] and Amarchand et al [20] reported that the C. septempunctata and syrphid fly population was maximum in the third and second week of December. Bana et al [21], Mishra et al [15] and Sharma et al [26] reported that the C. septempunctata population was maximum in the third and fourth week of January.The work of studies on correlation of predators population with the weather parameters are supported by the findings of Arvind [19] Amarchand et al [20] and Dotasara et al [24] reported that the non significant correlation with all weather parameters.…”