Abstract
Among the current methyl bromide alternatives under study, propylene oxide has shown potential to control soilborne diseases, nematodes, and weeds in polyethylenemulched tomato (Lycopersicon esculentum Mill.). However, further research is needed to determine the appropriate application rates to control sting nematode (Belonolaimus spp.) and nutsedge (Cyperus spp.) in the crop. Also, the effect of these pests on tomato nutrient absorption has not been determined yet. Therefore, field trials were conducted to determine the most effective application rates against these pests and their effect on nutrient uptake. Propylene oxide rates were 0, 190, 380, 570, 760, and 950 L·ha[sup-]. Data indicated that sting nematode and nutsedge populations rapidly decreased with 570 L·ha[sup-] of propylene oxide. For P and K foliar content, there was a linear increase of P concentration as rate increased, whereas K concentration increased rapidly after 190 L·ha[sup-] of propylene oxide. The highest tomato yields were obtained with application of 760 and 950 L·ha[sup-] of propylene oxide.
