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P. Yasodha ¹, P. Narayanasamy ¹

Affiliations
1 Department of Entomology, Annamalai University, Annamalainagar 608002, Tamil Nadu, IN

Abstract

Fungal infection on moths of lepidopteran pests of rice plant has been witnessed in certain parts of Tamil Nadu. Three entomopathogenic fungi viz., Mucor hiemalis Fusarium moniliformae and Scopulariopsis sp. have been isolated from the yellow rice borer, leaffolder cutworm and yellow hairy caterpillar moths of rice ecosystem. All the fungi are found pathogenic. In laboratory evaluation spore suspensions of moth infecting fungi each at concentration of lxl07 spores/ml revealed their virulence against yellow rice borer, leaf foldt;r and cutworm with 60, 61.60 and 52.6 per cent mortality.

Keywords

Cadaver, Entomophathogenic Fungi.

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R. Parthasarathy ¹, P. Narayanasamy ²

Affiliations
1 Project Directorate of Biological Control, P. B. No. 2491, H. A. Farm Pose, Bellary Road, Bangalore 560 024, IN
2 Department of Entomology, Annamalai University, Annamalai Nagar, 608 002, Tamil Nadu, IN

Abstract

The growth parameters and infectivity of an entornogenous fungus, Zoophthora radicans (Brefeld) Batko were promoted significantly when cultured on Sabouraud Maltose Agar+50 per cent prawn exoskeleton (biomass 725 mg;radial growth: 84.75 mm;sporulation 90.71 %;infectivity:71.90%) followed by 75 and 25 per cent dosages, thus revealing it to be a suitable ingredient in the synthetic media.

Keywords

Cnaphalocrocis medinalis, Growth Parameters, Infectivity, Prawn Exoskeleton, Zoophthora radicans.

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P. Narayanasamy ¹, J. Nirmala ¹, John Polhemus ²

Affiliations
1 Department of Entomology, Annamalai University, Annamalai Nagar - 608002, IN
2 3115 SO. York, Englewood, Colorado, 80110, US

Abstract

A survey of aquatic habitats including rice fields of certain localities in and around Chidambaram, Tamilnadu revealed the presence of a new species of ripple bug which is reported to be predatory on plant hoppers of rice in other countries. The insect thus gathered was identified as Microvelia douglasi douglasi Scott. (Veliidae:Heteroptera). The occurrence of this species is reported for the first time in India. Earlier, an unidentified species of Microvelia was reportedly found in the rice fields of Cuttack subsisting on brown planthoppers (Samal and Misra, 1981). Later, Microvelia atrolineata (Bergr.) was observed in karnataka as a natural enemy of the brown planthopper (BPH) Nilaparvata lugens (Stal.) (Gubbaiah, 1983).

Keywords

BPH, Nilaparvata lugens, Microvelia douglasi douglasi.

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