Informatics Publishing Limited

S. A. Ghorpade ¹, D. S. Pokharkar ¹, R. J. Rabindra ²

Affiliations
1 Division of Entomology, College of Agriculture, Pune-411005, Maharashtra, IN
2 Project Directorate of Biological Control, Post Bag No. 2491, H. A. Farm Post Bellary Road, Hebbal, Bangalore-560024, Karnataka, IN

Abstract

Mass production of Dipha aphidivora (Meyrick), a potential predator of sugarcane woolly aphid, Ceratovacuna lanigera Zehntner, was attempted in 'makeshift' type green shade nets of 40 and 50% mesh with temporarily installed bamboo frames by covering 6 and 7 months old sugarcane crop on small scale (25 m²). Seven-month-old sugarcane crop with 60-70% SWA infestation covered by 50% green shade net in bamboo frame of 5 × 5 m size yielded a maximum of 2700 larvae and pupae of D. aphidivora within 75 days.

Keywords

Dipha aphidivora, Mass Production, Shade Net, Sugarcane Woolly Aphid.

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M. B. Ingle ¹, S. A. Ghorpade ¹, H. S. Baheti ¹, S. R. Kamdi ¹

Affiliations
1 Department of Agril. Entomology, Mahatma Phule Krishi Vidyapeeth, Rahuri, Ahmednagar (M.S.), IN

Abstract

Bioassay tests in the laboratory were conducted to study the susceptibility of adult T. chilonis to different concentrations of endosulfan. The newly emerged F₁ progeny were subjected to increased concentration of endosulfan. It was found that after the treatment of adult T. chilonis with endosulfan for 15 generations, the LC₅₀ values of endosulfan increased by 13.27% from 0.0437% of base colony (susceptible) to 0.0495% of selected F₁₅ colony (tolerant). To study the mode of inheritance, the programme of back crossing was undertaken. LC₅₀ values of back cross progeny obtained was 0.0476% which was intermediate between susceptible (S) colony (LC₅₀ 0.0437%) and F₁₅ selected (R) colony (LC₅₀ 0.0495%) indicating that the gene for endosulfan tolerance is completely dominant.

Keywords

Bioassay, Trichogramma, Tolerance, Inheritance, Backcrossing.

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