P. R. Srinivas ¹, N. V. Krishnaiah ¹

Affiliations
1 Directorate of Rice Research, Rajendranagar, Hyderabad 500 030, IN

Abstract

Many workers observed the predatory activity of mirid bugs against rice hoppers (Bae and Pathak, 1966). The bugs prey on the eggs, nymphs and adults of rice leaf and planthoppers and have been considered as effective predators (Staphley, 1976). Of the mirid bugs, Cyrto rhinus lividipennis Reuter is widely distributed and most common; the other mirids preying on the planthoppers being Tytthus parviceps Reuter and T. chinensis (Stal) (Stanley, 1976; Manjunath et al., 1978; Basilo and Heong, 1990).

Keywords

Nilaparvata lugens, Mirid Predators, Tytthus parviceps.

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P. R. Srinivas ¹, S. Jayaraj ¹

Affiliations
1 Department of Entomology, Tamilnadu Agricultural University, Coimbatore - 641 003, IN

Abstract

The Important natural enemies contributing to the reduction of Heliothis armigera on pigeonpea, field bean and chickpea were Campoletis chlorideae Uchida, Eriborus sp., Carcelia sp., Bracon hebetor Say, and Apanieles sp. The activity of the parasitoids was more during the months of November and January. The maximum per cent parasitism recorded by B. hebetor, C. chlorideae, Eriborus sp. and Carcelia sp. were 35.50, 10.74, 10.24 and 38.95 respectively.

Keywords

Heliothis armigera, Campoletis chlorideae, Eriborus sp, Carcelia sp, Bracon hebetor, Apanteles sp.

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P. R. Srinivas ¹, S. Jayaraj ¹

Affiliations
1 Department of Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, IN

Abstract

There are several natural enemies of Heliothis armigera (Hbn.), which m the absence of pesticides, often maintain the pest populations below threshold levels. Thus there is a need to gather infonnation on the natural enemy complex available in the ecosystem so as to determine the vacant niches. Survey was undertaken at fortnightly intervals during 1983-85 to record the natural enemies in H. armigera in Coimbatore district of Tamil Nadu where pulses were grown more commonly during 1983-85.

Keywords

Heliothis armigera, Parasitoids, Predators, Survey.

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P. R. Srinivas ¹, I. C. Pasalu ¹

Affiliations
1 Department of Entomology, Directorate of Rice Research, Rajendranagar, Hyderabad- 500 030, IN

Abstract

During the survey of microbial diseases of rice pests, the nymphs and adults of brown planthopper (Nilaparvata lugens Stal.) were found dead in rearing cages due to fungal infection. The mycelium of the fungus emerged through the intersegmental membranes of the abdomen and the joints of the legs. The network of the white mycelium developed all over the body. The insects were found either sticking to the leaf sheath or floating on standing water, being overgrown by a white mass of spores. The fungus was isolated and purified on Sabouraud's dextrose agar with yeast extract medium (SDA+Y). The fungus was identified as Fusarium moniliforme var intermedium Neish and Leggett (IMI No.330804).

Keywords

Nilaparvata lugens, Fusarium moniliforme var intermedium.

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