| Popis: |
This experiment consisted of spraying 20 mimosa trees distributed over the Oklahoma State University campus. The test was non replicated except for the untreated trees which were replicated three times. Spray applications were applied as needed using a John Bean Sprayer 55, series L-1565-2 and a 785 John Bean Spraymaster deluxe gun which delivered 2.5 gal of finished spray for a 2 minute period at 450 p.s.i. Trees were sprayed to runoff. Sprays were applied to all treatments on June 21. The second spray application varied according to the infestation: treatment 7, July 16; treatments 1 , 2 , 4 , July 23; treatments 3, 8, 9, 10, Aug 9 and treatments 5, 6, Aug 18. All treatments received two applications over the growing season. Treatment effectiveness was evaluated by either counting the number of dead larvae found in 10 webbed bipinnately compound leaves per tree or recording the total number of webbed bipinnately compound leaves per tree. Dead larval counts were made the day following treatment. These dates were June 22, July 17, Aug 24, Aug 10 and Aug 19 depending upon treatment. Webbed bipinnately compound leave counts were made on June 2 1 , 28, July 1, 8, 15, 22, 29, Aug 5 , 1 1 , 18, and 26. After each count all webbed leaves were clipped from the tree so that they would not enter into succeeding counts. |
