Differential aphicidal effects of chitinase inhibitors on the polyphagous homopteran Myzus persicae (Sulzer).
Four chitinase inhibitors, cyclo-(Proline-Tyrosine), cyclo-(Histidine-Proline), allosamidin and psammaplin A, were selected for in vitro feeding experiments with the peach-potato aphid, Myzus persicae (Sulzer), under controlled photoperiod and temperature conditions. Artificial diets were used to provide chitinase inhibitors at 10, 50 and 100 microg mL(-1) to M. persicae. Except for cyclo-(Proline-Tyrosine), which did not modify aphid demographic parameters, chitinase inhibitors induced differential aphicidal effects on M. persicae. At all doses, cyclo-(Histidine-Proline) induced significant effects affecting daily fecundity, intrinsic rate of natural increase (r(m)) and doubling time of population. When compared with the control diet, allosamidin decreased nymph survival and daily fecundity, increasing the doubling time of population from 1 to 1.5 days. Psammaplin A was the most toxic inhibitor when delivered via artificial diet, as it induced the death of all aphids reared at 50 and 100 microg mL(-1). The results demonstrate the potential use of chitinase inhibitors as aphid management tools.
Saguez
Julien
J
Biologie des Entomophages (UPRES EA 3900 Biologie des Plantes et Contrôle des Insectes Ravageurs), Université de Picardie Jules Verne, 33 rue Saint Leu, 80039 Amiens Cedex, France. julien.saguez@u-picardie.fr
Dubois
Françoise
F
Vincent
Charles
C
Laberche
Jean-Claude
JC
Sangwan-Norreel
Brigitte S
BS
Giordanengo
Philippe
P
D000117:Acetylglucosamine / Q000031:analogs & derivatives*; D000818:Animals; D001042:Aphids; D002688:Chitinases / Q000037:antagonists & inhibitors*; D004220:Disulfides; D005260:Female; D007306:Insecticides; D014312:Trisaccharides; D014443:Tyrosine / Q000031:analogs & derivatives*
D004220:Disulfides; D007306:Insecticides; D014312:Trisaccharides; C054851:allosamidin; C098378:psammaplin A; D014443:Tyrosine; D002688:Chitinases; D000117:Acetylglucosamine