Étude de l’impact de la température et de l’humidité sur la survie et la dynamique de la ponte de la mouche du chou (Delia radicum L.)
Few simulation models for the cabbage maggot (Delia radicum L.) had been seen, but several include significant weaknesses for the insect genotypic differences and parameters used. The main objective of this project is to collect the missing information to create, in the future, a bioclimatic model that will efficiently simulate the dynamics of the populations of this pest.   The effect of soil temperature and moisture had been measured on eggs and larvae of the cabbage maggot. Humidity affects egg survival below 25% [w/w]. Gradual exposure of eggs to high temperature above 33°C also affects survival. Under tested conditions, larvae survival increases with rising temperatures and humidities. We believe that the maggot is well adapted to muck soil in Quebec, and we recommend to incorporated soil temperature rather than air temperature for above-ground stages into the development of a new model.   Egg-laying activity has also been studied from various pre-established criterions for each of the early- and late-emerging genotypes, at different temperatures. Except for the pre-oviposition which is longer for the early genotype, no differences were observed between genotypes. The majority of criterions, except for the duration of oviposition bouts and egg mortality, responded to temperature. The new information will be used for the preparation and development of a simulation model of the egg-laying dynamic of the cabbage maggot.
Delia radicum Oviposition Cabbage maggot Soil temperature Air temperature Soil moisture Egg-laying dynamic Early-emerging genotype Late-emerging genotype Bioclimatic model