Thermal requirements and estimates of the annual number of generations of Lobiopa insularis on strawberry crop

Abstract

Lobiopa insularis is one of the main pests of strawberry crop, causing direct damage to fruit, making them unfeasible for consumption and commercialization. This study aimed to estimate, under laboratory conditions, base temperature and thermal requirements of the eggs, larvae, pupae and the biological cycle (from egg to adult) of L. insularis. Insects were reared on artificial diet based on strawberry fruits, at temperatures of 16, 19, 22, 25, 28 and 31°C, using air-conditioned chambers (70±10% R.H.; 12 h photophase). The number of annual generations of L. insularis was estimated for eight municipalities belonging to the main strawberry growing regions in Brazil, considering base temperature and thermal constant. Development time of L. insularis was proportional to the temperature increase. The best development rate was obtained when insects were reared at 22 and 25ºC. Based on thermal requirements of L. insularis, the number of annual generations was estimated between 5 and 7 per year, according to the studied region.

Níveis de infestação de Zaprionus indianus (Diptera: Drosophilidae) em diferentes frutos hospedeiros

“…Enquanto que, D. suzukii, foi registrada em 2013 na região sul do Brasil (DEPRÁ et al 2014) e é considerada uma das principais pragas em cultivos de pequenos frutos e frutos de caroço (CINI et al 2012, SCHLESENER et al 2017 e, assim como a mosca-das-frutas sul-americana, ataca frutos íntegros ainda na planta (ATALLAH et al 2014, LEE et al 2015. Espécies de besouros Nitidulidae podem atacar frutos sadios, a exemplo de Lobiopa insularis (Castelnau, 1840) (Coleoptera: Nitidulidae) (ANDZEIEWSKI et al 2018), sendo os danos ocasionados tanto por larvas quanto por adultos, que também utilizam esse substrato para alimentação e oviposição (RONDON et al 2011). Alguns estudos relatam a associação entre Z. indianus e as espécies acima citadas em diversos frutos.…”