Integrating biocontrol agents with farmer’s practice: impact on diamondback moth, Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae) and cabbage yield

• Main Authors: Omprakash Navik, R. S. Ramya, Richa Varshney, S. K. Jalali, T. M. Shivalingaswamy, R. Rangeshwaran, Y. Lalitha, Jagadeesh Patil, Chandish R. Ballal
• Format: Article
• Language: English
• Published: SpringerOpen 2019-05-01
• Series: Egyptian Journal of Biological Pest Control
• Subjects: Plutella xylostella; Cabbage; Trichogramma; Bacillus thuringiensis; Integrated management
• Online Access: http://link.springer.com/article/10.1186/s41938-019-0140-x

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.