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.

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 and Residual Pest Control, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 228-228
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Pest Control ◽  
European Corn Borer ◽  
Spider Mites ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Corn Borer ◽  
Field Corn ◽  
Naturally Occurring ◽  
Plot Yield ◽  
Pollen Shed

Abstract Insecticides were applied by fixed wing airplane to field corn in the pollen shed stage on 1 Aug. All treatments were applied in water with 1.5 oz/acre Dynamic surfactant. Capture was applied at 0.08 lb Al/acre in total volumes of 1 gpa, 3 gpa and 5 gpa. Penncap-M was applied at 0.625 lb Al/acre in a total volume of 1 gpa. The plots were 120 ft wide and field length. Each treatment was replicated two times and arranged in a RCB design. Corn rootworm (CRW) beetles were counted on five plants in one row, each plant separated by four plants. Five leaves, on each of three plants, were evaluated for the presence of naturally occurring twospotted spider mites (TSM). Four plants in each plot were artificially infested with TSM 14 DAT. Five leaves on each of these plants were rated for mite colonies 21 and 28 DAT. European corn borer (ECB) damage was evaluated 86 DAT by splitting from root to tassel ten plants from each plot. Yield was determined by hand harvesting and shelling all ears from 40 ft of row.

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.

EFFICACY OF VARIOUS SOIL INSECTICIDES AGAINST WESTERN CORN ROOTWORM IN FIELD CORN, 2002

2003 ◽  
Vol 28 (1) ◽  
Author(s):  
R. R. Youngman ◽  
C. A. Laub ◽  
T. A. Dellinger
Keyword(s):  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Field Corn ◽  
Soil Insecticides

Effects of Adult Western Corn Rootworm (Coleoptera: Chrysomelidae) Ear Feeding on Irrigated Field Corn in Colorado

1986 ◽  
Vol 79 (6) ◽  
pp. 1609-1612 ◽  
Author(s):  
J. L. Capinera ◽  
N. D. Epsky ◽  
D. C. Thompson
Keyword(s):  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Field Corn

scholarly journals EFFICACY OF VARIOUS SOIL INSECTICIDES AGAINST WESTERN CORN ROOTWORM LARVAE ON FIELD CORN, 2001

2002 ◽  
Vol 27 (1) ◽  
Author(s):  
R. R. Youngman ◽  
C. A. Laub ◽  
T. A. Dellinger
Keyword(s):  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Field Corn ◽  
Soil Insecticides

scholarly journals Control of Western Corn Rootworm Larvae in West Central Nebraska, 1992

1994 ◽  
Vol 19 (1) ◽  
pp. 209-209
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Growth Stage ◽  
Rating Scale ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Root Damage ◽  
Time Of Application ◽  
Field Corn ◽  
West Central ◽  
The Press ◽  
Corn Plants

Abstract Granular insecticides were applied to suppress larval rootworm populations in 2 fields in west central NE. ‘Pioneer 3394’ hybrid field corn was ridge-planted in Field 1 with a John Deere Max-emerge planter, to a non-tilled seed bed on 11 May. Insecticides were applied at planting with insecticide boxes attached to the planter. Three replications of each treatment were arranged in a RCB design. T-band applications were made by applying a 7 inch band of insecticide in front of the press wheel. In-furrow applications were made by applying insecticide directly into the seed furrow. All insecticides were applied at a rate of 1114.5 g (AI)/ha. Field 2 was ridge-planted to ‘Fontanelle 4435’ and ‘Fontanelle 6240’ hybrid field corn with a John Deere Max-emerge planter, to a non-tilled seed bed on 6 May. With the exception of 4 strips, 12 rows in width, Counter 15G was applied at planting with insecticide boxes on the planter at a rate of 1114.5 g (AI)/ha. A granular and a liquid insecticide were applied to untreated strips in Field 2 immediately prior to cultivation on 15 Jun. The field corn plants were in the early whorl stage (growth stage 2) of development at the time of application. The granular application was applied over the whorl of the plants with insecticide boxes attached to a tool bar. The liquid insecticide was applied in a 7 inch band to the base of the plants in total volume of 120 liter/ha at 206,786 Pa (30 psi). Cultivation treatments were applied at a rate of 1114.5 g (AI)/ha. Each treatment in Field 2 was applied to 10 × 4 m plots which were replicated 4 times and arranged in a RCB design. Two blocks of treatments were applied to ‘Fontanelle 4435’ hybrid field corn plants and 2 blocks of treatments were planted to ‘Fontanelle 6240’ hybrid field corn plants. Treatments in both fields were evaluated 13 Jul by rating washed roots, using the 1-6 Iowa Root Damage Rating Scale, of 4 plants from each replicate.

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