No abstract

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.

No abstract

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.

Evaluation of red harvester ant control was conducted along a roadside outside of Perkins, Okla. Treatments were randomized and replicated 10 times. Ant mounds were checked for activity and marked before the start of the tests. Treatments were made on 19 Jul. Mounds were checked for activity 1, 2, 3, 4, and 8 weeks after treatment. If two ants were observed per mound, the colony was recorded as active. On the 8th week, all mounds were checked for activity by digging to a depth of 6 in. beneath the mound. Treatments were applied over each nest opening to cover an area 4 ft in diam. Diazinon drenches consisted of applying 1 gal of finished spray from a garden sprinkler can and Orthene 75SP was applied by evenly distributing two teaspoons of 75SP over the surface of the mounds. Rainfall in the area during the test was: Jul., 0.0 in.; Aug, 0.88 in.; and Sep., 1.99 in. for a total of 2.87 in.