Abstract
Abstract Three rates of methyl parathion were compared with the registered Diazinon® rate of 0.5 lb ai/acre for guar midge control. ‘Kinman’ guar was planted June 14 at the Texas Agricultural Experiment Station at Chillicothe. The experimental design was a randomized complete block with 4 replications. Plots were 4 rows wide, on 40-inch centers, by 100 ft long; and blocks were separated by cleared 25 ft alleys. Plots were sampled semi-weekly to monitor larval populations in guar buds. By August 10 all plots had reached an average of 30% bud infestation, the economic threshold. Insecticide applications were made in early morning of August 11 with a tractor mounted spray rig. With 1 nozzle/row the sprayer delivered 8.6 gal/acre at 60 psi. Plants were examined for phytotoxicity symptoms on August 15. No rainfall occurred during the post-treatment sampling period.
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