{"title":"Damage Thresholds for Cabbage Root Fly [Delia radicum (L.)] in Cauliflower Assessed from Pot Experiments","authors":"J. Bligaard","doi":"10.1080/09064719950135713","DOIUrl":null,"url":null,"abstract":"The influence of cabbage root fly [Delia radicum (L.)] on cauliflower dry matter production was investigated in three experiments during 1992 and 1993. Cauliflower plants grown outdoors in pots were inoculated with different numbers of cabbage root fly eggs, 1, 2, 3 or 4 weeks after transplanting as seedlings. A non-destructive method was used to estimate dry matter production during the growing season. Regression analyses of plant dry matter against egg number demonstrated that control measures against cabbage root fly larvae are needed to protect young seedlings during the first 3-4 weeks after planting, whereas 100 eggs or more were required to cause a 5% reduction in mean plant dry matter when plants were inoculated 4 weeks after transplanting. Egg and larval mortality varied with means in the range from 47 to 61% and density-dependent larval mortality was demonstrated in two out of four combinations of experiment and inoculation time.","PeriodicalId":40817,"journal":{"name":"Acta Agriculturae Scandinavica Section B-Soil and Plant Science","volume":null,"pages":null},"PeriodicalIF":1.7000,"publicationDate":"1999-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"9","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Agriculturae Scandinavica Section B-Soil and Plant Science","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1080/09064719950135713","RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"AGRONOMY","Score":null,"Total":0}
引用次数: 9
Abstract
The influence of cabbage root fly [Delia radicum (L.)] on cauliflower dry matter production was investigated in three experiments during 1992 and 1993. Cauliflower plants grown outdoors in pots were inoculated with different numbers of cabbage root fly eggs, 1, 2, 3 or 4 weeks after transplanting as seedlings. A non-destructive method was used to estimate dry matter production during the growing season. Regression analyses of plant dry matter against egg number demonstrated that control measures against cabbage root fly larvae are needed to protect young seedlings during the first 3-4 weeks after planting, whereas 100 eggs or more were required to cause a 5% reduction in mean plant dry matter when plants were inoculated 4 weeks after transplanting. Egg and larval mortality varied with means in the range from 47 to 61% and density-dependent larval mortality was demonstrated in two out of four combinations of experiment and inoculation time.
期刊介绍:
Acta Agriculturæ Scandinavica Section B publishes original research in applied soil and plant science with special attention given to to crop production in agri- and horticultural systems. We welcome manuscripts dealing with:
Climate smart and sustainable crop production systems
Water and nutrient efficiency
Soil conservation and productivity
Precise agriculture systems
Applications of bio- and nanotechnology
Digitalisation and robotics
Soil-plant interactions
Acta Agriculturæ Scandinavica, Section B – Soil & Plant Science forms part of a series of titles published on behalf of the Nordic Association of Agricultural Science (NJF). The series also includes Section A - Animal Science .