A. B. Idris
School of Environmental and Natural Resource Sciences, Faculty of Sciences and Technology, University Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
M. N. Mohamad Roff
MARDI Research Station Jalan Kebun, P. 0. Box 186, GPO, 41 720 Klang, Selangor, Malaysia
K. Hamsiah
MARDI Research Station Jalan Kebun, P. 0. Box 186, GPO, 41 720 Klang, Selangor, Malaysia
ABSTRACT
The study was conducted to determine the most effective chilli density inter-planted with maize to reduce the population of the aphid, Aphis gossypii and incidence of virus diseases on chilli. The treatments were MCMCMCM, MCCMCCM, MCCCCCM and CCCCCCC (M, Maize; C, Chilli). Results showed that the number of alate aphids caught per day and number of apterous aphid per plant was significantly different among treatments (P < 0.05). The number of apterous aphid per plant was found to be higher in plots where higher number of chilli plants were inter-planted with maize. However, there were no significant differences (P > 0.05) in the number of apterous aphid in treatments of MCMCMCM and MCCMCCM or in treatment of MCCCCCM and CCCCCCC. The number of apterous aphids per plant and counts of alate aphids per treatment were significantly (P < 0.05) more abundant in the monoculture plots than in other treatments. The number of apterous aphids was also found to be significantly different (P = 0.001) at different level of strata. The numbers were higher in lower than in upper stratum. Results showed that there was a significant correlation (r = 0.96, P < 0.05) between percent virus diseases and treatments, days after transplanting (DAT) and numbers of apterous and alate aphids. Incidence of virus diseases was only correlated with treatments and DAT after subjected to a stepwise elimination regression analysis. This suggests that the incidence of virus diseases were influenced by the number of chilli plants inter-planted with maize and duration of chilli plants exposed in the field. The cumulative percent of cucumber mosaic virus (CMV) incidence was significantly lower (P = 0.001) than chilli veinal mottle virus (CVMV) in all the treatments. However, there was no significant difference (P > 0.05) in the percent of CVMV incidence among the treatments. It was found that percent virus disease incidence significantly correlated (r = 0.45) with the rainfall. Result of this study suggests that the chilli-maize inter-cropping system of MCCMCCM could reduce the population of aphid and hence incidence of virus diseases on chilli.
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How to cite this article
A. B. Idris, M. N. Mohamad Roff and K. Hamsiah, 2001. Optimum Chilli Density Inter-planted with Maize in Relation to Aphid Population and Incidence of Virus Diseases on Chilli. Journal of Biological Sciences, 1: 1154-1157.
DOI: 10.3923/jbs.2001.1154.1157
URL: https://scialert.net/abstract/?doi=jbs.2001.1154.1157
DOI: 10.3923/jbs.2001.1154.1157
URL: https://scialert.net/abstract/?doi=jbs.2001.1154.1157
REFERENCES
- Mohamad Roff, M.N. and A.B. Idris, 1999. Effect of intercropping on the landing of alate aphids (Homoptera: Aphididae) and virus disease incidence on chilli (Capsicum annum) in Malaysia. Proceedings of the 5th International Conference of Plant Protection in the Tropics, March 15-18, Kuala Lumpur, Malaysia, pp: 79-83.