T. Dore et Jm. Meynard, ON-FARM ANALYSIS OF ATTACKS BY THE PEA WEEVIL (SITONA-LINEATUS L COL,CURCULIONIDAE) AND THE RESULTING DAMAGE TO PEA (PISUM-SATIVUM L) CROPS, Journal of applied entomology, 119(1), 1995, pp. 49-54
The study measures intensity of attacks by Sitona lineatus L. on pea c
rops in farmers: fields and the resulting damage. Insect attacks were
measured on the aerial parts of the plant at the vegetative stages and
on roots at the start of flowering of the crop. Attack intensity vari
ed between and within plots. Early sown crops were at greater risk of
severe damage. There was a good correlation between leaf damage at the
beginning of the crop cycle and damage to nodules at the start of flo
wering in unsprayed crops. Aerial spraying did not completely prevent
nodule damage in crops severely injured by insects at the early vegeta
tive stage. The effects of the attacks on nitrogen nutrition of the pe
a crop were also assessed; these results are discussed with regard to
the consequences for crop management.