Influence of intercropping on succession and population build up of insect-pests in early variety of red gram, Cajanus cajan (L.) Millsp

Singh, R.N. and Singh, K.M. (1978) Influence of intercropping on succession and population build up of insect-pests in early variety of red gram, Cajanus cajan (L.) Millsp. Indian Journal of Entomology, 40 (4). pp. 361-375.

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Abstract

Field studies were carried out in New Delhi, India, over 3 consecutive years (1973-75) to ascertain the effect on the incidence of pests of red gram (Cajanus cajan) of changing the crop canopy by intercropping red gram with green gram (Vigna radiata), black gram (V. mungo), cowpea (V. unguiculata), sorghum or pearl millet (Pennisetum americanum). The appearance of all the major pests was delayed, except for those attacking flowers and pods. By intercropping green gram, the appearance of Empoasca kerri Pruthi (Amrasca kerri), Cydia critica (Meyr.) (Eucosma critica), Oxyrhachis tarandus (F.), Clavigralla gibbosa Spin. and Nezara viridula (L.) was delayed by 2, 2, 2, 8 and 2 weeks, respectively. More or less similar trends in pest succession were observed with intercropping of other crops. Intercropping had a pronounced effect on the occurrence of some individual species, incidence of Empoasca kerri, O. tarandus, C. gibbosa, Heliothis armigera (Hb.) and Melanagromyza obtusa (Mall.) being adversely affected, while little effect on the population of Cydia critica was observed. The change in microclimate resulting from changing the crop canopy was probably responsible for these phenomena

Item Type: Article
Author Affiliation: Water Technology Centre, Indian Agricultural Research Institute, New Delhi-110012, India
Subjects: Plant Production > Croping Systems
Plant Protection > Pesticides
Plant Protection > Pests
Divisions: Pigeonpea
Depositing User: Ms K Syamalamba
Date Deposited: 22 May 2012 10:57
Last Modified: 22 May 2012 10:57
URI: http://eprints.icrisat.ac.in/id/eprint/5626

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