Longevity, Fecundity and Egg Hatching of Epichoristodes acerbella under Constant Temperatures (Lepidoptera: Tortricidae)
Gabarra, Rosa; Buisan, Alfons; Avilla, Jesus; Albajes, Ramon
Epichoristodes acerbella (Walker 1864) is the main pest of carnation crops in Spain. The effect of constant T (range 10-30°C) and larval diet (carnation and a semisynthetic diet) on longevity, number of egg batches and number of eggs per female, and egg hatching is studied. Male and female longevities are not significantly different. Longevity is significantly greater at 15°C (28.5 d) and smaller at 30°C (11.5 d). Fecundity is significantly smaller at the extreme T (10, 27 and 30°C ) and the maximum occurs at 25°C ( 469.0 eggs/female). Egg hatching is not affected by T, except at the lowest (10°C, 48.2 %) and highest (30°C, 0.0 %) ones. The fecundity of the females developed on the 3 larval diet tested is not significantly different. Taking into account the mean and maximum T of the Spanish areas where E. acerbella occurs, it is concluded that it can mate and reproduce during the winter and that the role played by summer T in the limitation of the populations of this Tortricidae Species may be more important in the S' areas of Spain.