scholarly journals Control of Western Corn Rootworm Larvae in West Central Nebraska, 1993

1994 ◽  
Vol 19 (1) ◽  
pp. 211-211
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
West Central

scholarly journals Control of Western Corn Rootworm Larvae in West Central Nebraska, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 178-178
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Central Research ◽  
Silt Loam ◽  
West Central ◽  
The University ◽  
Extension Center

Abstract Insecticides were applied to suppress larval rootworm populations in 2 fields in west central NE. Both fields located at the University of Nebraska West Central Research and Extension Center were composed of Cozad silt loam soils.

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.

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.

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