scholarly journals Insecticide Control of Adult Western Corn Rootworm and Subsequent Effect on Twospotted Spider Mites in West Central Nebraska, 1992

1994 ◽  
Vol 19 (1) ◽  
pp. 210-210
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Spider Mite ◽  
Western Corn Rootworm ◽  
Large Individual ◽  
Twospotted Spider Mite ◽  
Pesticide Application ◽  
Field Corn ◽  
Arthropod Predators ◽  
Subsequent Effect ◽  
Insecticide Control ◽  
Twospotted Spider

Abstract Various pesticides were applied to blister stage (R6 stage) hybrid field corn on 9 Aug, near North Platte, in westcentral NE. The treatments were applied with a CO2-charged backpack sprayer through 8001 flat fan nozzles at 206,786 Pa (30 psi), in a total volume of 196.4 liter/ha (21 gal/acre). Each treatment was applied to 3 × 10 m plots, replicated 4 times in a RCBD. Three d before the pesticide application the number of WCR beetles was counted on 2 randomly-selected plants in the middle of each plot. Three d prior to application, 3 spider mite-infested plants in each plot were marked to follow population trends on the same plants. The size of twospotted spider mite colonies was rated on the underside of 3 leaves on each of these plants, one below the ear, the ear leaf and one leaf above the ear. Ratings were made on a 0-6 scale where 0 = no mites, 1 = individual mites, 2 = small colonies, 3 = large, individual colonies, 4 = large connected colonies but not completely covering the underside of the leaf, 5 = colonies completely covering the underside of the leaf, 6 = leaf dead due to spider mite damage. These plants were also evaluated for the presence of arthropod predators. Two d following application the number of rootworm beetles was evaluated by counting all beetles on two randomly selected plants in the middle of each plot. Previously marked plants were evaluated for the size of twospotted spider mite colonies and the presence of arthropod predators at 7, 14, 21 and 44 DAT. Data were statistically analyzed with analysis of variance and an LSD test was used for mean separation.

scholarly journals Control of Western Corn Rootworm Beetles and Effect on Spider Mites in West Central Nebraska, 1992

1994 ◽  
Vol 19 (1) ◽  
pp. 209-210
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Spider Mite ◽  
Plant Size ◽  
Western Corn Rootworm ◽  
Large Individual ◽  
Corn Rootworm ◽  
Pesticide Application ◽  
Field Corn ◽  
West Central ◽  
Arthropod Predators ◽  
Predatory Insects

Abstract Various pesticides were applied to blister stage (R6 stage) hybrid field corn on 10 Aug, near North Platte, in west central NE. The treatments were applied with a CO2 charged backpack sprayer through 8001 flat fan nozzles at 206,786 Pa (30 psi), in a total volume of 196.4 liter/ha (21 gal/ acre). Each treatment was applied to 3 × 10 m plots, replicated 4 times in a RCBD. Five days before the pesticide application Banks grass mites were applied to 2 plants in the center of each plot by attaching 2 well-infested leaves with strapping tape. Four days following application the number of rootworm beetles and predatory insects were evaluated by counting all beetles on four randomly selected plants in the middle of each plot. For each artificially infested plant size of mite colonies was rated on the underside of 3 leaves below the ear, the ear leaf and 2 leaves above the ear at 9, 17, 27 and 46 DAT. Ratings were made on a 0-6 scale where 0 = no mites, 1 = individual mites, 2 = small colonies, 3 = large, individual colonies, 4 = large connected colonies but not completely covering the underside of the leaf, 6 = leaf dead due to spider mite damage. In addition to evaluation of spider mite colonies, arthropod predators were also counted.

scholarly journals Insecticide Control of Western Corn Rootworm Beetles, 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 225-226
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Spider Mites ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Pesticide Application ◽  
Field Corn ◽  
Insecticide Control

Abstract Various pesticides were applied to milk stage (R7 stage) field corn on 14 Aug., near North Platte, NE. The treatments were applied with a CO2-charged backpack sprayer through 8001 flat fan nozzles at 30 psi (206, 786 Pa), in a total volume of 21 gal/acre (196.4 liter/ha). Each treatment was applied to 3 X 10 m plots, replicated 4 times, in a RCB design. Three days before the pesticide application the number of WCRW were counted on 4 randomly selected plants in the middle of each plot. In addition, the presence of spider mites was evaluated on the same plants by inspecting leaves below the ear leaf for colonies the size of a quarter or larger. The number of WCRW and the number of mite infested leaves were evaluated 3 and 14 DAT on 4 different randomly selected plants in the middle of each plot. In addition to counting the number of mite infested leaves, the size of the mite colonies was rated on a 0-6 scale, on the 3 lowest leaves of 4 different randomly selected plants 14 DAT.

Sign in / Sign up

Export Citation Format

Share Document