Development and thermal requirements of Trichogramma pretiosum Riley Hymenoptera Trichogrammatidae on eggs of Bonagota cranaodes Meyrick Lepidoptera Tortricidae Desenvolvimento e exigencias termicas de Trichogramma pretiosum Riley Hymenoptera Trichogrammatidae em ovos de Bonagota cranaodes Meyrick Lepidoptera Tortricidae
D.F.nseca, F.L.; Kovaleski, A.; Foresti, J.; Ringenberg, R.
Neotropical Entomology. November-December; 346: 945-949
The aim of this study was to evaluate the development of Trichogramma pretiosum Riley on eggs of Bonagota cranaodes (Meyrick) under different temperatures. B. cranaodes eggs were maintained under seven constant temperatures (14, 18, 20, 22, 25, 28 and 30deg. C), 70 10% R.H. and, 14 h L. Forty replicates with 20 parasitized eggs each were kept in glass tubes (8.5 x 2.5 cm) covered with a plastic film. The method of hyperbole was used to calculate the temperature threshold (Th) and the thermal constant (K). The Tb obtained was 11.9deg. C and to thermal constant was 153,4 DD. The most favorable temperature range was from 25deg. C to 30deg. C, at which the shortest egg-adult development period and the highest survivorship were observed.