红褐斑腿蝗的生物学特性及发生规律

Bionomics and Occurrence of Catantops Pinguis

对红褐斑腿蝗的形态特征、生物学特性、发生规律及其与环境因素的关系进行了研究。结果表明：红褐斑腿蝗在冀西山区1 a发生1代,以成虫越冬;卵期35～60 d,蝻期60～82 d,成虫260～280 d。日均温度0℃以下时,成虫进入越冬休眠期,翌年3月上旬开始活动,成虫在极端最低温度-17℃可生存越冬;蝗卵孵化早晚与环境温湿度和天气变化等关系密切,蝗卵在地势高、排水良好的地块发育快、出土早,反之则慢出土晚,自然孵化率73.5%。蝗蝻分6个龄期,各龄期以其触节数、体长、翅芽形状和体色区别。可人工捕捉蝗蝻和成虫,处理越冬寄主、中耕深翻灭卵,化学防治标准为谷黍田蝗蝻2～4头/m^2,小麦苗期成虫4头/m^2。

The morphological characters, bionomics and the relationship between occurrence and environmental factors of catantops pinguis were studied. The results showed that catantops pinguis occurs 1 generation a year in west mountainous regions of Hebei Province. It overwinters with the adult. Period of egg is about 35-60 d, nymph stage is 60-82 d, and adult stage is 260-280 d. The adult begins to overwinter when the daily mean temperature is below 0 ℃ and ends in early March of the next year. It can survive at extremely lowest temperature -17 ℃. Whether locust eggs can incubate has close relations with the temperature, humidity and weather. The locust eggs develop fast and emerge early where high terrains and easy water drainage. The reverse is late. The percentage of the eggs incubated is 73.5%. The nymph of catantops pinguis is divided into six instars which are differentiated with body length, wing bud shape and body colort. Artificially capturing the nymph and adult insects, intertill and proper treatments of field debris and the plants harbouring overwintering pupae can provide an effective control of the pest. When the nymph reaches 2-4 per square meter and the adults reach 4 per square meter chemical control should be carried out.