DIFFERENTIAL TOLERANCE OF PUMPKIN SPECIES TO BENTAZON, METRIBUZIN, TRIFLURALIN, AND OXYFLUORFEN

ABSTRACT Response of pumpkin species including Cucurbita pepo convar. Pepo, Cucurbita moschata Duch, Cucurbita pepo, Cucurbita maxima, and Lagenaria vulgaris to bentazon, trifluralin, metribuzin, and oxyfluorfen was evaluated in Outdoor pot experiments in 2014 and 2015. Different postemergence doses (bentazon and oxyfluorfen) and preplant incorporated (metribuzin and trifluralin) herbicides were evaluted on pumpkin species at various growth stages. Results showed that the sensitivity of pumpkins species to applied herbicide varied greatly among tested species. On overall, dry weights of Cucurbita spp. were reduced by 12.50%, 48.60%, 23%, and 73.13% when pumpkin was treated with trifluralin, metribuzin, bentazon and oxyfluorfen, respectively. Pumpkin crops were not tolerant of metribuzin and oxyfluorfen and plants showed injures. Results indicated that trifluralin and bentazon have the potential for possible application in pumpkin particularly when broadleaf weeds are dominant.

摘要 本研究于2014年与2015年开展室外盆栽试验，评估了包括西葫芦（Cucurbita pepo convar. Pepo）、中国南瓜（Cucurbita moschata Duch）、普通南瓜（Cucurbita pepo）、笋瓜（Cucurbita maxima）以及葫芦（Lagenaria vulgaris）在内的供试物种对苯达松（bentazon）、氟乐灵（trifluralin）、嗪草酮（metribuzin）与乙氧氟草醚（oxyfluorfen）的响应情况。研究在不同生育期对供试材料施用不同剂量的苗后除草剂（苯达松与乙氧氟草醚）以及播前土壤处理除草剂（嗪草酮与氟乐灵）并开展药效评价。结果表明，供试南瓜属物种对所施用除草剂的敏感性存在显著种间差异。总体而言，经氟乐灵、嗪草酮、苯达松与乙氧氟草醚分别处理后，南瓜属植物的干重分别降低12.50%、48.60%、23%与73.13%。南瓜类作物对嗪草酮与乙氧氟草醚耐受性较差，植株出现药害症状。研究结果显示，氟乐灵与苯达松具备在南瓜种植中应用的潜力，尤其当田间以阔叶杂草为优势杂草时。