Informatics Publishing Limited

D. Sundararaju ¹, P. C. Sundara Babu ²

Affiliations
1 National Research Centre for Cashew, Puttur 574 202, Karnataka, IN
2 Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, IN

Abstract

The egg parasitoids of Helopeltis antonii Signoret existing in neem endemic area (coastal and hinterland of Tamil Nadu) and in non-neem endemic area (western ghats of Tamil Nadu and coastal Karnataka) are Telenomus sp. laricis group (Scelionidae), Erythmelus helopeltidis Gahan (Mymaridae), Chaetostricha sp. and Ufens sp. (Trichogrammatidae). Telenomus sp. is very much dominant in non-neem endemic areas, whereas Ufens sp. is quite prominent in neem endemic areas. When the eggs of H. antonii laid on neem were exposed for natural parasitism, neem has not exerted any adverse interaction on Telenomus sp.

Keywords

Egg Parasitoids, Helopeltis antonii.

Full Text

   

D. Sundararaju ¹

Affiliations
1 National Research Centre for Cashew, Puttur, (D.K.), Karnataka, IN

Abstract

Surveys were undertaken to record the natural enemies of the tea mosquito bug, Helopeltis antonii Sign. the key pest of cashew in South India. Three species of Hymenopteran endoparasitoids, viz., Telenomus sp. larieis group (Hym : Scelionldae), Chaetostricha sp. (Trichogrammatidae) and Erythmelus helopeltidis Gahan (Fam : Mymaridae) were recorded on the eggs. Bochartia sp. (Acarina : Erythraeidae) was recorded as an ectoparasite on nymphs and adults. Seasonal occurrence of Telenomus sp. and Chaetostricha sp. was studied at two locations for two years (June 1990 to May 1992). Telenomus sp. was observed almost throughout the year with a range of 1.8 to 45.5 per cent parasitism, whereas Chaetostricha sp. was noted mostly during cropping season (November-May) with relatively low level of parasitization of 0.7 to 4.3 percent. None of the weather factors (temperature, relative humidity and total rainfall) showed any significant influence on the parasitic activity of Telenomus sp.

Keywords

Heleopeltis antonii, Cashew, Parasitoids, Telenomus sp., Cbaetostricha sp., Erythmelus helopeltidis Bochartia sp.

Full Text

   

N. Baktha Vatsalam ¹, D. Sundararaju ¹

Affiliations
1 National Research Centre for Cashew, Puttur, Karnataka 574 202, IN

Abstract

Plocaederus ferrugineus L., P. obesus Gah and Batocera rufomaculata DE G are the stem and ischolar_main boring pests of cashew. Among them, P. ferrugineus is the most dominant species. Rajapakse aud Jeevaratnam (1982) reported that P. ferrugineus infestation could be effectively checked with Oryctes baculovirus in Sri Lanka. An attempt was made to study the efficacy of Oryctes baculovirus (OBV) in the control of P. ferrugineus and P. obesus in the field and laboratory conditions and the results are reported in this short paper.

Keywords

Oryctes Baculovirus, Plocaederus ferrugineus, P. obesus, Pathogenicity.

Full Text

   

D. Sundararaju ¹

Affiliations
1 National Bureau of Agriculturally Important Insects, Hebbal, Bangalore-560 024, IN

Abstract

Seven species of bee that maintained constancy on cashew flowers were identified from coastal Karnataka [(Pseudapis oxybeloides (Smith), Lasioglossum sp. and Halictus sp., Halictidae; Braunsapis sp., Ceratina smaragdula (F.) and Ceratina sp., Apidae)] and four species from coastal Tamil Nadu [(Ceratina (Pithitis) binghami Cockerell, C. smaragdula, Braunsapis sp. and P. oxybeloides)]. Time spent by bees for visiting the flowers ranged from 0.8 to 25.1 seconds per flower. Diversity of flora recorded during 2003-08 as floral resources for nectar for all the above bee species during lean and flowering periods of cashew - both at coastal Karnataka and Tamil Nadu - is presented in this paper.

Keywords

Diversity of Bees, Floral Resources, Cashew.

Full Text