Phytotoxicity Tests for Oils, 1982

Abstract

Two separate tests were conducted to evaluate Ortho Volck Oil Spray and Volck Spray + Diazinon 25EC at 3 different rates for phytotoxicity on 3 species of ornamentals. It involved treatment of 3 different types of field grown nursery stock that were located on a horticulture research farm outside of Stillwater. Treatments were made with a 2 gal B&G compressed air sprayer at approximately 20 psi. All plants were treated to run-off. The check plants were treated with water to run-off. Test 1 was applied on Jun 15 and Test 2 on Jul 20. Temperature and wind velocity at the time of treatments were 85°F, 5-8 mph and 81°F, 2-4 mph respectively for Test 1 and 2. Each treatment was replicated 3 times. In Test 1, plants were examined 1, 7, 14 and 28 days after treatment. In Test 2 plants were examined 1, 3, 7 and 14 days after treatment. Phytotoxicity was recorded as none, slight, moderate, severe, or killed.