摘要
用大蜡螟诱集法,对在北京地区采集的175个土样进行了线虫分离,得到斯氏属线虫5个,异小杆属线虫6个,小杆线虫2个。土样有线虫率为13.1％。土样有线虫率与植被、土壤质地有关。从4种植被下采集土样的有线虫率分别是:果园28.2％、菜地10.5％、大田作物7.7％、未耕地0。4种土壤质地中土样有线虫率为:松沙土20.8％、砂壤土15.1％、中壤土12.2％、轻壤土5.4％。本土线虫对桃小食心虫、韭菜蛆、小木蠹蛾、二化螟的侵染力均高于引进的线虫。
One hundred and seventy five soil samples were collected from different soil types and habitats in the Beijing area during 1987-1988 to examine the occurrence of entomopathogenic nematodes. Larvae of the wax moth, Galleria mellonella were placed in the soil samples to attract nematodes. Five species of Steinernema, 6 species of Heterorhabditis and 2 species of Rhabditld were obtained, amounted for a 13.1% nematode incidence of the samples. The incidence rate of the nematodes was found to be influenced by both soil type and habitat. The incidence rates in the soils of orchards, vegetable gardens, cereal fields and non-cultivated land were 28.2%, 10.5%, 7.7% and o%, respectively, while those in loose sandy, sandy loam, mid loam and light loam soils were 20.8%, 15.1%, 12.2% and 5.4%, respectively. All the new nematode isolates showed higher infectivity to fruit peach borer (Carposina niponensis), carpenterworm (Holcocerus insularis), chive maggot (Bradysia odoriphage) and rice stem borer (Chilo suppressalis) than the introduced nematodes currently used against these pests in China.
关键词
昆虫
病原线虫
土样有线虫率
植被
entomopathogenic nematodes Galleria mellonella Steinernema Heterorhabditis Rhabditid Holcocerus insularly Bradysia odoriphage Chilo suppressalis
