Phytotoxicity to transplanted lettuce (Lactuca sativa) of three pre-emergence herbicides: metolachlor, pendimethalin, and propachlor
1993
Henderson, C.W.L. | Webber, M.J. (Queensland Dept. of Primary Industries, Gatton (Australia))
Phytotoxicity was investigated in 5 field experiments conducted in southern Queensland during 1990-91. Metolachlor was applied before transplanting lettuce seedlings in 2 experiments, but the results showed that the risks of phytotoxicity preclude its use in transplanted lettuce in this environment. It was found that the use of pendimethalin at 1-1.3 kg a.i. per ha would control or suppress many important broadleaf weeds in lettuce, as well as a range of grasses. Propachlor was less phytotoxic when applied immediately after transplanting the lettuce seedlings than when sprayed before transplanting. Use of 2 kg a.i. per ha of propachlor would give a suppressive effect against several broadleaf weeds, but another herbicide would also be required to achieve effective weed control. A spraying strategy involving pendimethalin and propachlor herbicides in transplanted lettuce has the potential to reduce weed control costs by up to 80 percent.
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