不同长豇豆品种对豇豆荚螟种群数量影响的研究

研究通过３ａ的田间试验，分别对长豇豆４０个品种中豇豆荚螟花朵和豆荚上幼虫种群数量作了分析，揭示了不同豇豆品种的要和豆荚上的幼虫数量存在着显著差异。试验用的长豇豆４０个品种中，新青豆角的花朵上和豆荚上幼虫数量都比其它品种的少，只有在１９８８年试验中，粤夏２号的虫数量比新青豆角的少但差异不显著。研究结果显示，在对相同长豇豆品种花朵上幼虫数量（ｘ）与豆荚上幼虫数量（ｙ）呈现正相关关系。

Study on Effects of Varieties of Asparagus Bean onPopulation of Maruca testulatis

Forty varieties of asparagus bean Vigna unquiculata W.ssp. sesquipedalis (L.) Verd were studied in three years in vegetable farm in the University, to test the effects of varieties of asparagus bean on the population of Maruca testulalis Geyer. The results in the experiments showed that the densities of the larvae of the insect pest in the flowers and in the beans were different significantly between the varieties of the bean. The larval densities of variety Xinqing were 18, 17.3 and 6.33 larvae in 30 flowers of the bean in 1988, 1989 and 1990 respectively, and lower than other varieties. It was found that the larval population between the stages in flowers and in beans showed a positive regression corelationship.