Studies on control of crab to a pest-insect and three kinds of weeds in rice-crab paddy-fields.

doi:10.11924/j.issn.1000-6850.0402178

Chin Agric Sci Bull ›› 2004, Vol. 20 ›› Issue (2) : 178-178. DOI: 10.11924/j.issn.1000-6850.0402178

SHAO Yidong， YANG Yizhong， YU Yueshu，SHAO Hong，LU Ziqiang

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Abstract

Feeding behavior of crab to a pest-insect (Nilaparvata lugens) and three kinds of weeds (Spirodela polyrrhiza， Echinochloa crusgalli， Juneceus serotinlls) in rice-crab paddy-fields were studied． The results showed that crab had different food-take to the weeds at its early stage， the order was S． polyrrhiza > J． serotinlls > E． crusgalli during the crab’s period of growth. But with the development of crab，it was getting smaller and smaller， even no food-take；In designed N． lugens population density (5～40 heads)， the functional response was belong to Holling-I． Three linear regression equations of experiment were as follows：Na=0.4167N-1.75， Na=0.4486N-2.0929 and Na=0.4505N-2.1857， the correlation coefficients all reached 0.99．

Key words

Eriocheir sinensis;Nilaparvata lugens;three kinds of weeds;food-take

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SHAO Yidong， YANG Yizhong， YU Yueshu，SHAO Hong，LU Ziqiang. Studies on control of crab to a pest-insect and three kinds of weeds in rice-crab paddy-fields.[J]. Chinese Agricultural Science Bulletin. 2004, 20(2): 178-178 https://doi.org/10.11924/j.issn.1000-6850.0402178

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