On-line version ISSN 1678-4499
CHAGAS FILHO, Norton Rodrigues; MICHELOTTO, Marcos Doniseti; SILVA, Ricardo Adaime da and BUSOLI, Antonio Carlos. Nymphal development of Myzus persicae (Sulzer, 1776) (Hemiptera: Aphididae) on eggplant at different temperatures. Bragantia [online]. 2005, vol.64, n.2, pp. 257-262. ISSN 1678-4499. http://dx.doi.org/10.1590/S0006-87052005000200013.
The objective of this work was to study the nymphal development of Myzus persicae on leaves of eggplant (Solanum melongena) at four constant temperatures. The experiment was carried out in the bio-control laboratory, with the following controlled conditions: temperatures (15, 20, 25 and 30 ºC ± 1 ºC); relative humidity (70% ± 10%), and photophase (12 hours). The biology of M. persicae was followed on leaf discs (3 cm diameter) kept in Petri dishes containing a layer of agar-water (1%). It was evaluated the best fitted curve to the biological aspects of M. persicae, as well as their regression equations and respective determination coefficients (R2). The number of nymphal stage was affected by temperature: 15 and 20 ºC, resulted in 30.4% and 4.2% of nymphs showing an 5th nymphal stage, respectively. At 15, 20, 25 and 30 ºC, nymphal phase lasted for 9.4; 7.6; 5.9 and 7.0 days, respectively. Temperatures of 15 and 20 ºC were more favorable to nymphal development of M. persicae on leaf discs of eggplant.
Keywords : Solanum melongena; green peach aphid; biology.