Published online by Cambridge University Press: 10 July 2009
Sweet corn (Zea mays) is frequently attacked by Oscinella frit (L.) in southern England because the optimal sowing date (1st–20th May) determines the appearance of the seedlings at the peak of the spring flight (13th–30th May).
A Latin-square experiment including three Thimet treatments and controls showed that almost complete protection could be given by seed-furrow and surface placements along the rows of an 8 per cent, granular formulation at the rate of 2 lb. actual Thimet per acre.
The crop on the untreated control plots was more than halved by the naturally occurring infestation of 45 per cent, of the primary shoots.
Estimation of Thimet residues in cobs taken from the seed-furrow treatment showed that only a very minute trace of toxic material was present.
Tasting tests on cobs from treated plots revealed no detectable taint.