The test was conducted on a windbreak planting of Siberian elmjj, approximately 20 ft tall, located 2 mi south of Stillwater, Oklahoma. Trees were treated on Jul 26 when the temperature was 92 F and the wind velocity was 5-10 mph. A majority of the larvae were in 2nd and 3rd instar, approximately 8-12 mm long. Application equipment consisted of a Marco R-20 sprayer which delivered 1.6 gal/min at 200 psi. Trees were treated to run-off. Treatments were randomized and replicated 3 times. Larval counts were made by examining 18 in of terminal branch at 10 locations per tree.

Control of red harvester ants was evaluated in 2 separate tests. Test 1 was conducted along a roadside outside of Perkins, OK. Test ? was conducted at the OSU Agricultural Research Station near Perkins, OK. Treatments in both tests were randomized and replicated 10 times. Ant mounds were checked for activity and marked prior to the start of the tests. Treatments for Test 1 and 2 were made on Jun 9 and Jul 22, respectively. Mounds were checked for activity 1, 2, 3, 4 and 8 wk after treatments. If 2 ants were observed per mound, the colony was recorded as active. On the 8th wk, all mounds were checked for activity by digging to a depth of 6 in beneath the mound. Treatments were applied over each nest opening which covered an area 4 ft in diameter. Drenches consisted of applying 1 gal from a garden sprinkler can and granules were evenly distributed over the surface of the mounds. In Test 2, Cessco aerosol treatments were made by dividing each mound into quadrants and making 1 injection per quadrant plus 1 center injection in the middle of the nests at an application rate of 4 or 8 sec per injection. Rainfall in the area of all tests was: Jun, 4.37 in; Jul, 1.98 in; and Aug, 1.38 in for a total of 7.73 in.

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.

Bagworm control was evaluated on a Chinese arborvitae hedge located in Stillwater, OK. Seventy-five ft of hedge was utilized and teatments were randomized and replicated 3 times. Each treatment consisted of a 5 ft section 8-10 ft high. Plants were sprayed until run-off with a Marco R-20 sprayer which delivered 1.6 gal/min at 200 psi. Treatments were made on Jul 8, when the temperature was 90 F and wind velocity ranged from 0-5 mph. A pretreatment count from 10 locations on each of the 9 replications showed an average of 9.5 larvae, 0.25 to 0.75 inches long, per 18 inches of terminal branch. Mortality was determined by examining 10 larvae from each replication at 1, 3, 7, 14 and 21 days after application.

Hawthorn lace bug control was evaluated on a pyracantha hedge located in Stillwater, Oklahoma. Three hundred feet of hedge was utilized and treatments were randomized and replicated 3 times. Each treatment consisted of a 20 ft section 4-5 ft high. Application equipment consisted of a Marco R-20 sprayer which delivered 1.6 gal/min at 200 psi. Sprays were applied until run-off. Treatments were made on Jun 28 when the temperature was 84 F and the wind velocity was 5-8 mph. Infestations were determined by counting adults and nymphs on 6 in of terminal branch at 20 locations in each treatment.