Managing caterpillar pests of Brassica crops
作者单位：Horticulture Research InternationalWillington RoadKirtonBostonLincsPE20 IEJ、UK ADAS Arthur RickwoodMepalElyCambsCB6 2BAUK Horticulture Research InternationalWeUesbourneWarwickCV35 9EFUK
会议名称：《The Meeting of Integrated Control in Field Vegetable Crops》
会议日期：1995年
学科分类：09[农学] 0904[农学-植物保护] 090401[农学-植物病理学] 090402[农学-农业昆虫与害虫防治]
基 金：for allowing us to sample caterpillars within their crops and the Ministry of Agriculture Fisheries and Food the Horticultural Development Council,MicroBio Ltd and Oecos for supporting this work
摘 要：正In the UK,the five main caterpillar pests of Brassica crops are Plutella xylosteUa（diamond-back moth）,Mamestra brassicae（cabbage moth）, Evergestis forficalis（garden pebble moth）,Pieris rapae（small white butterfly） and Pieris brassicae（large white butterfly）.Although attacks by all five species were sporadic during 1994 and 1995,*** and P. rapae were the two most numerous pests. Forecasts of the timing of activity are being developed for all five species using both published information and data collected from new experimental *** is known about the temperature requirements for development of *** nor is there much information on the requirements for post-winter development for any of the five species. To provide data to validate the forecasts,pheromone traps and water traps are being used to determine the pattern of adult activity at four locations during *** feasible,weekly counts are being made of the numbers of eggs,larvae and pupae on insecticide-free plots. To develop a’user-friendly’ sampling system,data on the within-crop distribution of the immature stages of all five species were collected.’Edge’ effects were apparent for some species,but the data need detailed statistical analyses before firm conclusions can be drawn. Preliminary laboratory bioassays showed that there was considerable variation in the susceptibility of pest species to the Bacillus thuringiensis products available in the *** was the least susceptible of the species *** potential of a new product,which is based on a different, trans-conjugant,strain of Bt,is being assessed.