Abstract
Rice is considered one of the staple foods in Southeast Asian countries, most especially in the Philippines. There are many factors needed to be considered in growing rice crops: the soil nutrient, the climate, the water supply, and the fertilizer used as a supplement to crop growth. But one important thing that farmers should consider is the infestation of pests, specifically the green leafhoppers, which is the primary carrier of tungro virus. This virus affects the growth and development of rice crops. This study aims to investigate the insecticidal effect of Bambusa vulgaris and Bambusa malingensis shoot and leaves extract against green leafhoppers (Nephotettix virescens). The extract was obtained by the decoction method. Phytochemical analysis of the two bamboo species has been carried out, as it was found out that both of them contains alkaloids, flavonoids, and glycosides. The results showed that both the shoot and leaves extract of Bambusa vulgaris and the shoot extract of Bambusa malingensis have potential insecticidal activity against Nephotettix virescens. Further research is needed to identify other factors that could strengthen the effectiveness of applying the extract to the insect specimen.
Highlights
Farmers described tungro as a significant problem in rice fields
Tungro is one of the diseasecausing viruses which greatly affected the rice crops in Southeast Asian countries (Tantera, et al, 1973). It is associated with rice tungro bacilliform virus (RTBV) and rice tungro spherical virus (RTSV) which causes the leaf yellowing and stunting of rice crops (Hibino et al, 1978; Omura et al, 1983)
This paper aims to investigate the bioactive phytochemicals in Bambusa vulgaris and Bambusa malingensis shoot and leaves extract based on the mortality rate of N. virescens
Summary
Farmers described tungro as a significant problem in rice fields. The cause of the disease and its spreading was not clearly understood. The Nephotettix virescens is the primary vector of tungro-related disease in rice crops (Hibino and Cabunagan, 1986). Tungro is one of the diseasecausing viruses which greatly affected the rice crops in Southeast Asian countries (Tantera, et al, 1973) It is associated with rice tungro bacilliform virus (RTBV) and rice tungro spherical virus (RTSV) which causes the leaf yellowing and stunting of rice crops (Hibino et al, 1978; Omura et al, 1983). It causes great yield loss in rice crops production The occurrence of such disease is associated with the density of vector present which determines the amount of virus-carrying organism present in a rice field (Suzuki et al, 1992). Virus-causing insects can be reduced by effectively restraining the feeding activity of N. virescens
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