十字花科蔬菜虫害经济阈值研究概况及其分析  

Review and Analysis of the Economical Threshold on Insect Pests in Brassicaceac Vegetables

作　　者：朱芳枝[1] 朱骏[1] 彭友林[1] 王云[1] 

机构地区：[1]湖南文理学院生命科学系

出　　处：《长江蔬菜》2008年第B08期9-13,共5页Journal of Changjiang Vegetables

摘　　要：通过对国内、外十字花科蔬菜虫害损失率及经济阈值研究情况分析及蔬菜害虫幼虫食叶试验、功能叶剪叶试验和不同条件下虫害动态观察,结果表明:十字花科蔬菜缓苗期及结球始期对虫害敏感,莲座期及菜球充实期耐虫性强;菜球减质量与剪外叶减质量对产量影响趋于相同;莲座期外叶受损,有超补偿能力,可放宽防治指标;莲座期防治指标为菜青虫每株5头,斜纹夜蛾每株1.5头,甜菜夜娥每株7.5头等。The objective of this paper is to Determine the economical threshold of insect pests in Brassicaceae vegetable, optimize synthetic prevention and cure technology. The information is collected about investigation on losing rate and economical threshold of insect pests in Brasscicaceae vegetables in this coutry. Leaf feeding, functional leaf cutting experiment with larva, and insect pests dynamic observation were carried out under different conditions. We determined vegetable losing rate and economical threshold after injured by insect pest. The result sowed that Brassicacae vegetables are sensitive to insect pests at rosette and head initiation stages, resistant to insect pests at folding and head filling stages. The effect on yield is the same between weight reduction of head and outer leaf, the damage of outer leaves at rosette stage was super-compensative, those control index range can be widen. We found that： the control index at rosette stage was 5, 1.5, 7.5 insects per plant for pieris rapae, prodenia litura and spodopiera exgigua respectively. This results will provide supervisory value for preventing insect pests in Brassicacae vegetable crops.

关 键 词：十字花科蔬菜 害虫 经济阈值 作物 补偿能力 

分 类 号：S436.3[农业科学—农业昆虫与害虫防治] S433[农业科学—植物保护]