scholarly journals Evaluation of Selected Insecticides and Application Timings for Control of Cereal Leaf Beetle and Aphids on Wheat, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 308-308
Author(s):  
G. F. Chappel ◽  
D. A. Herbert
Keyword(s):  
Experimental Design ◽  
Growth Stage ◽  
Leaf Beetle ◽  
Post Treatment ◽  
Row Spacing ◽  
Application Timing ◽  
Standard Testing ◽  
Cereal Leaf Beetle ◽  
Final Treatment ◽  
Eggs And Larvae

Abstract Efficacy of selected insecticides and application timing was evaluated against CLB and aphids in wheat. Pioneer 2580 was planted 8 Nov in a producer’s field in Dinwiddie County, VA, using a 7-inch row spacing. All treatments were broadcast as foliar sprays with water using a CO2 pressurized backpack sprayer calibrated to deliver 20.0 gpa at 30 psi through 8004VS flat fan nozzles spaced 19 inches apart on the spray boom. A RCB experimental design was used with 4 replicates: plots were 17 rows by 50 ft. CLB sampling involved recording the number of eggs and larvae/ft2 (20.57 inches of a 7-inch row). Aphids were sampled by removing 5 randomly selected grain heads per plot. Samples were placed in a mild soapiwater solution (2 drops liquid dish detergent per gal water) for 10 minutes. Samples were then rinsed over a U.S.A. Standard Testing Sieve No. 60 mesh, and the total number of aphids per sample recorded. Defoliation was evaluated by removing 10 randomly selected flag leaves from each plot and visually recording the percent defoliation per leaf. Average percent defoliation was recorded per plot. Treatments 1-5 were applied at Zadok’s growth stage (GS) 31 (3 Apr), treatments 6-10 at Zadok’s growth stage 37 (23 Apr) and treatments 11-15 at Zadok’s growth stage 56 (6 May). Post-treatment CLB egg and larvals samples were taken 3 days after final treatment (9 May). Post-treatment aphid and defoliation samples were taken 24 days after final treatment (24 May).

scholarly journals Cereal Leaf Beetle Control on Malting Barley, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 204-204
Author(s):  
Sue L. Blodgett ◽  
Cecil Tharp ◽  
Deb Waters
Keyword(s):  
Leaf Beetle ◽  
Row Spacing ◽  
Malting Barley ◽  
Cereal Leaf Beetle ◽  
Tiller Stage ◽  
Insecticide Efficacy ◽  
Eggs And Larvae

Abstract Malting barley was planted by a producer located near Edgar, MT on 13 Apr. Plots were 20 ft long and 8 rows wide (1 ft row spacing) and arranged in a RCB design with four replications (Trial 1) and 3 replications (Trial 2). Insecticide applications were made using a backpack, CO2-powered sprayer equipped with TeeJet XR8002VS nozzles, calibrated to deliver 8.2 gpa at 30 psi. Number of CLB eggs and larvae per plant were counted on 3 plants from center rows. Plots in Trial 1 were treated on 17 May when barley was at 2 to 3 tiller stage and evaluated on 1,3, and 11 DAT. No CLB larvae were detected until 28 May. A second trial was conducted to determine insecticide efficacy on CLB larvae. Plots in Trial 2 were treated on 4 Jun when barley was beginning to joint and evaluated on 1,3, 7, and 14 DAT. Data were analyzed using ANOVA and means were separated using DMRT.

Effects of Herbicide Application Timing on Johnsongrass (Sorghum halepense) and Pitted Morningglory (Ipomoea lacunosa) Control

1990 ◽  
Vol 4 (4) ◽  
pp. 900-903 ◽  
Author(s):  
David R. Shaw ◽  
Sunil Ratnayake ◽  
Clyde A. Smith
Keyword(s):  
Growth Stage ◽  
Field Experiments ◽  
Sorghum Halepense ◽  
Herbicide Application ◽  
Ipomoea Lacunosa ◽  
Application Timing ◽  
Final Treatment ◽  
Pitted Morningglory

Field experiments were conducted to evaluate the influence of application timing of imazethapyr and fluazifop-P on rhizome johnsongrass and pitted morningglory control in soybean. Herbicides were applied at three timings keyed to johnsongrass heights of 15, 30, and 60 cm and 3-, 6-, and 9-leaf pitted morningglory. Evaluations 6 wk after the final treatment indicated imazethapyr controlled both species best when applied at the 15-cm johnsongrass growth stage. Increasing imazethapyr rate did not increase control of pitted morningglory, but did increase johnsongrass control at the 15-cm application timing. However, at the 30-cm johnsongrass application timing, increasing the rate from 0.07 to 0.10 kg ha-1improved control of both species. Johnsongrass control with imazethapyr was no more than 64% when applications were delayed to 30-cm or larger johnsongrass. Fluazifop-P controlled johnsongrass well at all timings.

Distribution and Seasonal Phenology of Cereal Leaf Beetle (Coleoptera: Chrysomelidae) on Wheat in Tennessee

1993 ◽  
Vol 28 (4) ◽  
pp. 363-369 ◽  
Author(s):  
Jerome F. Grant ◽  
Charles R. Patrick
Keyword(s):  
Triticum Aestivum ◽  
Triticum Aestivum L ◽  
Leaf Beetle ◽  
The State ◽  
Economic Threshold ◽  
Seasonal Incidence ◽  
Cereal Leaf Beetle ◽  
Oulema Melanopus ◽  
Eggs And Larvae ◽  
Experimental Plots

A three-year study was conducted to assess the distribution and seasonal incidence of cereal leaf beetle, Oulema melanopus (L.), on wheat, Triticum aestivum L., in Tennessee. Cereal leaf beetle was distributed across the state with populations most frequently encountered in eastern and middle Tennessee. Cereal leaf beetle adults were active in wheat fields during late March to early April; eggs were found from late March to early May; and larvae were found from early April to early June, peaking during mid May. In our experimental plots, larval densities exceeded the suggested economic threshold during each year. F1 adults emerged from late May to late June and fed approximately 2 wks on corn and other available Graminae plants. Adult activity then ceased; adults, eggs, and larvae were not encountered again until the following March and April.

scholarly journals Evaluation of Dimilin and Boron on Soybean in Virginia, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 282-282
Author(s):  
D. A. Herbert ◽  
D. L. Holshouser
Keyword(s):  
Experimental Design ◽  
Untreated Control ◽  
Visual Inspection ◽  
Growth Stage ◽  
Main Stem ◽  
Row Spacing ◽  
Hollow Cone ◽  
Plot Yield ◽  
Pod Development ◽  
Pod Number

Abstract Dimilin 2 L and Boron 10 (1.0 lb B/gal), alone and tank mixed, were evaluated for effects on BLB adults, GCW larvae, leaf defoliation, pod number and yield of soybean. Asana XL was included as an insecticide standard, as was an untreated control. ‘Accomac’ soybean was planted 29 May at the Tidewater Agric. Res. and Ext. Ctr., Suffolk, VA, using a 36-inch row spacing. All treatments were applied as foliar sprays with water on 8 August at the R3 soybean growth stage (beginning pod development, with a 3/16-inch long pod at one of the 4 uppermost nodes on the main stem with a fully developed leaf) using a tractor sprayer calibrated to deliver 15.0 gpa at 50 psi through 3, D3-23 hollow cone nozzles per row. A RCB experimental design was used with 4 replicates; plots were 8 rows by 50 ft. Insect samples were taken using a standard beat cloth on 6 row ft per plot on 18, 26, 31 and 38 days after treatment (DAT). Defoliation was assessed by visual inspection of all leaves on 10 plants per plot. Pod number was determined just prior to harvest by counting all pods on 20 plants per plot (5 adjacent plants in the row, in 4 locations in each plot). Yield was determined by harvesting 2, 2-row samples per plot (a total of 200 row ft per plot) using a commercial soybean combine.

Registration of Two Cereal Leaf Beetle Resistant Barley Germplasms

Crop Science ◽  
1984 ◽  
Vol 24 (4) ◽  
pp. 828-828 ◽  
Author(s):  
D.H. Smith ◽  
J.A. Webster ◽  
J.E. Grafius
Keyword(s):  
Leaf Beetle ◽  
Cereal Leaf Beetle
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