Relative abundance of stem borer species and natural enemies in rice ecosystem at Madhupur, Tangail, Bangladesh

Ks Islam,Maa Mamun,Mm Rahaman,M Jahan

doi:10.3329/jbau.v12i2.28681

Ks Islam, Maa Mamun + Show 2 more

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https://doi.org/10.3329/jbau.v12i2.28681

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Abstract

The relative abundance of different stem borer species and their natural enemies with interaction effects were studied at three growth stages of irrigated Boro rice at Madhupur under the district of Tangail, Bangladesh during January to April, 2013. Five stem borer species viz; Yellow stem borer (Scirpophaga incertulas), Pink stem borer (Sesamia inferens), Dark headed stem borer (Chilo polyhcrysus), Stripped stem borer (Chilo suppressalis), White stem borer (Scirpophaga innotata), and nine different natural enemies were collected from the rice fields and recorded. The population of stem borers and natural enemies was highest in tillering stage and lowest in seedling stage. The relative abundance of stem borer species under investigation showed ranking order; yellow stem borer >dark headed stem borer>pink borer>white borer>stripped stem borer and natural enemies as ladybird beetle >long jawed spider>wolf spider>damselfly>carabid beetle>green mirid bug>lynx spider>dragon fly>ear wig. Populations of all five stem borers were positively correlated with ladybird beetle, wolf spider, long jawed spider, lynx spider, damsel fly, dragon fly, green mirid bug and negatively correlated with carabid beetle and earwig.J. Bangladesh Agril. Univ. 12(2): 267-272, December 2014

Highlights

Rice (Oryza sativa L.) is one of the world’s most important crops providing a staple food for nearly half of the global population (FAO, 2004)
Abundance of stem borers and natural enemies at different growth stages are presented in the Table 1A, 1B, 2A and 2B
Correlations among stem borer species and natural enemies are presented in the Table 3

Summary

Introduction

Rice (Oryza sativa L.) is one of the world’s most important crops providing a staple food for nearly half of the global population (FAO, 2004). It is the major food crop of Bangladesh accounting for 70 percent of the cultivated area, 78 percent of the irrigated area, 52 percent of the agricultural GDP and 71 percent of the caloric intake (Hassan and Bakshi, 2005). Rice is grown in three seasons in Bangladesh that includes Aus (April-July), Amon (July-December) and Boro (December-April). Research has contributed significantly in achieving food security by increasing the yield potential of rice through development of HYV’s (Hassan and Fischer, 1995). Farmers are using modern varieties, fertilizers, pesticides, water and other technologies intensively which have eventually changed the ecology and escalated pest proliferation (Parvin, 2010)

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