The population abundance of the aphid, Aphis gossypii Glover and its coccinellid predator as well as the relationship between aphid population abundance and virus disease incidence on five varieties of chilli with different forms of plant architecture was determined. Chilli varieties with short and prostrate plant architecture (MC-12) had higher population of aphids and coccinellids than the chilli varieties with tall and erect plant architecture (Kulai and MC- 11), suggesting that the chilli variety with prostrate plant architecture harboured higher aphid population. The number of alate aphids trapped per week was generally higher in early than in the middle and late seasons. The accumulative percentage of virus disease incidence was significantly (P < 0.05) different among chilli varieties. The accumulative percentage of virus disease incidence was also significantly correlated (r = 0.86, P < 0.05) with days after transplanting and types of chilli varieties but not with the total number of apterous aphids. However, percentage of virus disease incidence was inversely correlated (r = 0.69, P = 0.02) with the number of alate aphids collected per week. Light intensity and air temperature had significant correlation with number of apterous aphids and coccinellid populations in chilli varieties with erect plant architecture only. However, there were no correlations in the number of apterous aphids and coccinellids in relation to rainfall and evaporation rate. The effects of infestation by A. gossypii and incidence of virus diseases on chilli varieties with different plant architecture and recommendation on the types of chilli to be used as cultural control are also discussed.
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A. B. Idris, M. N. Mohamad Roff and S. G. Fatimah, 2001. Effects of Chilli Plant Architecture on the Population Abundance of Aphis gossypii Glover, its Coccinellid Predator and Relationship with Virus Disease Incidence on Chilli (Capsicum annum). Pakistan Journal of Biological Sciences, 4: 1356-1360.
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