M. Swamiappan ¹, M. Balasubramanian ²

Affiliations
1 Department of Entomology Tamil Nadu Agrilcultural University, Coimbatore 641 003, IN
2 World Bank, 70 Lodi Road, New Delhi - 110003, IN

Abstract

Chemicals appear to playa major role at evert level of host selection process by insects. Kairomones are interspecific chemical messengers, the adaptive benefit of which falls on the recipient rather than emitter (Brown et al., 1970). According to Vinson (1976), the chemicals that are involved in host-parasite relationship viz., host location and host selection process have been referred to as kairomones which are derived from the host. Many specie~ of parasitoids have been shown to respond to kairomones.

Keywords

Opisina arenosella, Eriborus trochanteratus, Host Location, Kairomones, Larval Crass.

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S. Pathummal Beevi ¹, M. Balasubramanian ²

Affiliations
1 Cashew Research Station, Madakkathara - 680 656, Thrissur, Kerala, IN
2 World BanK, 21 Jor Bagh, New Delhi - 110 003, IN

Abstract

The chitin synthesis inhibitors, buprofezln and diflubenzuron were tested for their safety in comparison with the Insecticides viz., phosalone (0.08%), triazophos (0.08%), monocrotophos (0.07%) and endosulfan (0.07%) against Encarsia shafeel Hayat, a parasite of Bemisia tabaci Genn. Buprofezln and diflubenzuron were safe to the adult parasites even at a high dose of 0.1%. When the parasite larvae were exposed to the treatments, buprofezln suppressed the adult emergence at high concentrations of 0.05 and 0.1 %. Invariably, all the Insecticides were toxic to the larvae and adults of parasite. Considering the extent of toxicity to adult parasites, phosalone was less toxic than the other insecticides. Against Immature stage of the parasite, endosulfan, phosalone and monoerotophos were equally toxic. Triazophos was highly detrimental to both adult as well as Immature stages of the parasite.

Keywords

Buprofezin, Diflubenzuron, Encarsia shafeei, Bemisia tabaci, Phosalone, Endosulfan, Triazophos, Monocrotophos.

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