Mb. Thomas et al., EXPERIMENTAL STUDIES TO EVALUATE SPRAY APPLICATIONS OF A MYCOINSECTICIDE AGAINST THE RICE GRASSHOPPER, HIEROGLYPHUS-DAGANENSIS, IN NORTHERNBENIN, Entomologia experimentalis et applicata, 87(1), 1998, pp. 93-102
Three experiments were conducted to examine the effects of spray appli
cations of a mycoinsecticide against the rice grasshopper, Hieroglyphu
s daganensis, in northern Benin. The experiments were designed to expa
nd on previous evaluation studies and contribute to a better understan
ding of the overall impacts of mycoinsecticide applications. The first
experiment showed that acquisition of spores from the spray residue h
ad a significant effect on mortality rate and a greater single influen
ce on mortality than direct contact with spores from the spray aerosol
. The second and third experiments revealed the mycoinsecticide to hav
e sub-and pre-lethal effects, causing a significant reduction in per c
apita feeding rate and increasing susceptibility to predation. The sig
nificance of these results for the overall impact of spray application
s and for development of comprehensive evaluation methods are discusse
d.