Abstract
In order to describe seasonal flight activity of the cabbage maggot Delia radicum (L.) adults in relation to Julian days (JD), degree-day accumulations (DDA) and precipitation, flight dynamics were followed weekly with the use of yellow sticky traps (YST). Climatic data were collected and DDA were calculated using the lower developmental threshold of 4.3 °C. The efficacy of four insecticides applied either as standard foliar treatment or through dipping the seedlings before transplanting was determined. Seasonal flight activity during the cultivation season of a mid-early variety of white cabbage was correlated with DDA and JD and was characterized by having two peaks. The first peak occurred between 119 ± 7.5 JD and 125.5 ± 8 JD when DDA was 471.35 ± 74.97 °C. The second occurred between 172.8 ± 6.1 JD and 179.3 ± 6.7 JD when DDA was 1,217.28 ± 96.12 °C. The DDA, cumulative capture of flies and JD are suitable for predicting the timing of insecticide application. Spraying with insecticides should be applied when the cumulative capture of flies reaches 100 flies/YST and when DDA reaches 400 °C. If only one parameter reaches the threshold, additional visual surveys should be employed to establish the level of infestation. Insecticides were able to ensure only partial control. In the future, alternative control tactics which employ seed treatments and nonpesticide measures should be investigated in Croatia.
Highlights
Seasonal flight activity of the cabbage maggot during the cultivation season of the mid-early variety white cabbage in a mountain region of Croatia was correlated with degree-day accumulations (DDA) and Julian days and characterized by two peaks that correspond with two generations
If the cabbage maggot is controlled by foliar application of insecticides, the application should be conducted after peak egg occurrence and before peak larval infestation
Our results agree generally with those of other workers, differences in degree-day and Julian day requirements occurred between the cabbage maggot in a mountain region of Croatia and those from geographically distant populations
Summary
Capitata L.) production in Croatia is conducted on approximately 11,000 ha. Cabbage is one of the most important. There are three main production regions, including north Croatia (in the vicinity of the cities of 9DUDåGLQ DQG ýDNRYHF the Mediterranean region (along the Adriatic coast) and the mountain region (in the vicinity of the city of Ogulin). Among the pests in the region of Ogulin, the cabbage maggot, Delia radicum (L.), is the most important [1].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
