Abstract
A field trial was conducted in a farmer’s field by integrating biocontrol agents, a multiple insecticide tolerant strain (MITs), Trichogramma chilonis and formulation of Bacillus thuringiensis (NBAIR BtG4) with reduced insecticidal spray as a biocontrol-based IPM compared to insecticidal application as a farmer’s practice, for the management of the diamondback moth (DBM), Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae) infesting cabbage. Six T. chilonis releases of 100,000 parasitized eggs ha− 1 were applied. Along with parasitoid release, a liquid formulation of B. thuringiensis (2%) was applied after third and fifth releases of T. chilonis. The number of P. xylostella larvae were significantly reduced in the field treated with biocontrol-based IPM as compared to farmer’s practice after 30 and 45 days after treatment. After the 45 days, the holes on cabbage leaves were 2.2/plant in the field treated with biocontrol, opposed to 8.0 holes per plant were recorded in the farmer’s practice filed. Only 7% of cabbage head damage was recorded in the field treated with biocontrol, whereas, in farmer’s practice field, those were 32.2%. The cost-benefit analysis showed that integrating these biological control agents along with a reduced number of insecticidal sprays could reduce DBM population and percent head damage with an eventual increase in the yield.
Highlights
Cabbage (Brassica oleracea var. capitata L.) is one of the extensively grown vegetable crops in India
Source of Trichogramma chilonis and Bacillus thuringiensis The multiple insecticide-tolerant egg parasitoid strain, T. chilonis (NBAII-MP-TRI-13) was obtained from the Division of Genomic Resources, ICAR-National Bureau of Agricultural Insect Resources (NBAIR), Bengaluru, India, where it is maintained under selection pressure of 5 groups of insecticides for the last 10 years and mass-produced in the Insectary of the Division of Germplasm, Conservation, and Utilization, ICAR-NBAIR, Bengaluru
The management strategies were based on the occurrence of diamondback moth (DBM) and suitable biocontrol inputs that were integrated with farmer practices
Summary
Cabbage (Brassica oleracea var. capitata L.) is one of the extensively grown vegetable crops in India. In the present study, adaptation of the biocontrol-based IPM, using an insecticide tolerant strain of T. chilonis (NBAII-MP-TRI-13) and liquid formulation of B. thuringiensis (NBAIR BtG4) for the management of DBM in cabbage field in comparison with farmer’s applications of insecticides were assayed. These estimations were monitored at 15, 30, and 45 days after treatment (DAT) with farmer’s practice and biocontrol-based IPM.
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