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- Title
Different Population Phenologies of Grapholita molesta (Busck) in Two Hosts and Two Nearby Regions in the NE of Spain.
- Authors
Amat, Carles; Bosch-Serra, Dolors; Avilla, Jesús; Escudero Colomar, Lucía Adriana
- Abstract
Simple Summary: In two fruit-producing provinces in north-east Spain (Girona and Lleida), the moth pest (Grapholita molesta) can drastically affect production of their main fruit crops, apples and peaches, respectively. Populations of this pest can be monitored using traps; this enables determination of the optimal time to spray insecticides. This method requires labour and provides information about the population up to that date. Insect forecast models can complement this information, helping producers to anticipate increases in pest populations and thus allow more time to plan for moth control. However, informal observations indicate that the most used model in both regions does not predict precisely the evolution of the population of G. molesta in Girona. To start addressing this problem, we described the population dynamic of G. molesta and the commonly used prediction model was applied to both provinces. Significant differences were found between the provinces. In Girona, four generations were detected and five in Lleida; the length of each generation was higher in Girona. The prediction model did not fit the phenology of G. molesta in Girona, confirming that such models should be checked before applying them in regions other than the one for which they were originally created. Grapholita molesta is an important pest of stone and pome fruits. In commercial orchards, integrated pest management programs use pheromone traps to monitor the population dynamics of G. molesta and adjust treatments. Phenology models can be used to forecast the population phenology of pests and to help optimise the time point at which to spray the orchards with insecticides. In the present study, the adult population phenologies of G. molesta in two provinces of north-east Spain were studied, as well as their fit to the phenology model most used in both provinces. Weekly captures of adults in pheromone traps through the season were recorded over 5 y in a large number of commercial orchards, and these data were used to determine the number of generations of G. molesta in each province. The results show significant differences between provinces in the generation time, being 97 degree days (DD) shorter in the Lleida province than in the Girona province. In Girona province, four generations were registered, while five were detected in Lleida. As a result of the differences found, the phenology model was not able to predict precisely the population dynamics in the Girona province.
- Subjects
PHEROMONE traps; PEACH; STONE fruit; POPULATION dynamics; PEST control; ADULTS; POPULATION forecasting
- Publication
Insects (2075-4450), 2021, Vol 12, Issue 7, p612
- ISSN
2075-4450
- Publication type
Article
- DOI
10.3390/insects12070612