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Effect of Stage of Growth on Metribuzin Tolerance
Published online by Cambridge University Press: 12 June 2017
Abstract
Six species of Solanaceae including tomato (Lycopersicon esculentum Mill ‘Campbell 28′) were sprayed in the greenhouse at weekly intervals for 4 weeks starting when tomato plants had one true leaf. All species gained tolerance to metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazine-5(4H)one] with age but tomato and black nightshade (Solarium nigrum L.) were the most tolerant and gained tolerance fastest with age. Jimsonweed (Datura stramonium L.) and eggplant (Solanum melongena L. ‘Black Beauty’) were the most susceptible species and the ones that gained least tolerance with age. Potato (Solanum tuberosum L.) from true seeds and pepper (Capsicum annuum L. ‘Yolo wonder’) were intermediate in tolerance. In the field, tomato and nine weed species planted in separate plots and kept free from competition were sprayed at weekly intervals starting when tomato plants had one true leaf. Tomato, large crabgrass (Digitaria sanguinales (L.) Scop.), ivyleaf morningglory (Ipomoea hederaceae (L.) Jacq.) and yellow foxtail (Setaria glauca (L.) Beauv.) were the most resistant species to metribuzin and the ones that gained tolerance fastest with age. The most susceptible weeds were velvetleaf (Abutilon theophrasti Medic), common purslane (Portulaca oleracea L.), pale smartweed (Polygonum lapathifolium L.), redroot pigweed (Amaranthus retroflexus L.), common lambsquarters (Chenopodium album L.), and jimsonweed. Low amounts of sunlight during the 3 days before spraying greatly reduced the resistance of tomato to metribuzin.
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- Copyright © 1977 by the Weed Science Society of America
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