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Evaluation of acephate on gladiolus for control of thrips and lepidopterous larvae

, : Evaluation of acephate on gladiolus for control of thrips and lepidopterous larvae. Proceedings of the Florida State Horticultural Society 88: (1976) 584-586

Acephate was applied to gladiolus at 3 locations and 4 rates (0.5, 0.75, 1.0 and 1.5 lb AI[active ingredient]/acre) and compared to an unsprayed check and either a grower's standard program or methomyl treatment. Although counts of lepidopterous larvae were low, ranging from 1.2 to 7.9/100 untreated plants, significantly more untreated plants were damaged than treated plants at all locations. Insect damage to plants at the lowest acephate rate was significantly greater than other acephate treatments in only 1 location. Plants treated with acephate were less damaged than either the grower or methomyl treatments. Populations of gladiolus thrips on spikes harvested and held 5 days for flower development were also low, ranging from 1.1-6.7/untreated spike. Untreated spikes were infested with 95.8% of the collected thrips. No visual phytotoxicity (chlorotic or dead tissue) was observed on 2 cultivars, 'Friendship' and 'Peter Pears,' even when sprays were applied directly to open flowers. Neither spike length nor corn yield was significantly affected by treatment for either cultivar (cv.).

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