scholarly journals Selected Granular Insecticide Treatments for Control of Southern Corn Rootworm Injury in Two Peanut Fields, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 283-283
Author(s):  
D. A. Herbert
Keyword(s):  
Experimental Design ◽  
Soil Characteristics ◽  
Moderate Level ◽  
Row Spacing ◽  
Corn Rootworm ◽  
Statistical Procedures ◽  
Southern Corn Rootworm ◽  
Pod Wall ◽  
Level Of Risk

Abstract Granular insecticides were evaluated for control of SCR pod injury in Virginia-type peanut in 2 fields in Suffolk, VA. The 2 fields selected differed in soil characteristics but were both considered to represent a moderate level of risk to pod damage by SCR. ‘VA-C 92R’ peanuts were planted on 3 May (Field 1) and 23 May (Field 2) using a 36-inch row spacing. All treatments were applied in a 14-inch band over the row with a tractor-mounted Noble granular applicator on 28 June (at the time of early pegging). A randomized complete block experimental design was used with 4 replicates; plots were 4 rows by 200 ft (Field 1) and 4 rows by 180 ft (Field 2). Pod injury was determined 28 Aug and again 25 Sep from all full-sized pods from 5 randomly selected plants per plot. Pods were categorized as immature or mature and as undamaged, scarred (superficial damage to the outer pod wall), or penetrated (pod wall penetrated). Yield was determined by digging, combining, drying and weighing peanuts from the 2 center rows of each plot (400 row ft per plot, 4 Oct - Field 1; 360 row ft per plot, 14 Oct - Field 2). Data were analyzed using ANOVA and LSD statistical procedures.

scholarly journals Selected Liquid and Granular Treatments for Control of Southern Corn Rootworm Injury in Peanut, 1994

1995 ◽  
Vol 20 (1) ◽  
pp. 222-222
Author(s):  
D. A. Herbert
Keyword(s):  
Experimental Design ◽  
Flowering Time ◽  
Row Spacing ◽  
Corn Rootworm ◽  
Statistical Procedures ◽  
Southern Corn Rootworm ◽  
Pod Wall ◽  
Flat Fan Nozzle

Abstract Liquid and granular insecticide formulations were evaluated for control of SCR pod injury in cv. ‘NC 7’ Virginia-type peanut in Suffolk, VA. Peanuts were planted on 11 May using a 36-inch row spacing. All treatments were applied in a 14-inch band over the row either just before planting (band, ppi), at planting (at plant), or on 28 Jun (flowering). Liquid treatments were applied with a CO2 pressurized backpack sprayer calibrated to deliver 17 gal formulation per acre at 22 psi through one 8004E flat fan nozzle per row. Granules were applied with a tractor- or bicycle-mounted Noble granular applicator. Preplant treatments were soil incorporated 3 to 4 inches deep using a land conditioner. Flowering time banded treatments were lightly soil incorporated with cultivator sweeps in row middles. A randomized complete block experimental design was used with 4 replicates; plots were 4 rows by 30 ft. Pod injury was determined 20 Sept from 100 randomly selected pods per plot, taken from 5 plants per plot (20 pods/plant). Pods were categorized as undamaged, scarred (apparently superficial damage to the outer pod wall), or penetrated (pod wall penetrated). Yield was based on digging, combining (4 Oct), drying and weighing peanuts from the two center rows (60 row feet) of each plot. Data were analyzed using ANOVA and LSD statistical procedures.

scholarly journals Different Application Schedules and Insecticide Rates for Control of Bollworm in Virginia Cotton. 1995

1996 ◽  
Vol 21 (1) ◽  
pp. 252-253
Author(s):  
D. A. Herbert
Keyword(s):  
Experimental Design ◽  
Virginia Tech ◽  
Row Spacing ◽  
Hollow Cone ◽  
Statistical Procedures ◽  
Standard Rate ◽  
Over The Top

Abstract Different application schedules with insecticides at different rates were evaluated for control of bollworm in VA. ‘Sure-Grow 501’ cotton was planted 1 May at the Virginia Tech Tidewater Agric. Res. & Ext. Ctr., Suffolk, VA, using a 36-inch row spacing. All treatments were applied with a CO2 pressurized backpack sprayer calibrated to deliver 14.5 gpa at 50 psi through three, D2-13 disc-core hollow cone nozzles per row, one over the top of the row and one on each side. Four application schedule/insecticide rate combinations were tested: 1)3 applications at the standard rate, the 1 st at the egg threshold, the 2nd in 5d, and the 3rd in l0d; 2) 2 applications at the standard rate, the 1st at the egg threshold, the 2nd in 5d; 3) 2 applications, the 1st at the egg threshold using 1.6x the standard rate, and the 2nd in 5d using the standard rate; 4) 1 application at the egg threshold using 1.6x the standard rate. Egg threshold application was based on the presence of 10 or more bollworm eggs per 100 plant terminals, or 2 or more per 100 fruil (squares or bolls). A RCB experimental design was used with 4 replicates; plots were 6 rows by 30 ft. Boll damage and bollworm numbers were determined by sampling 25 randomly selected bolls per plot. Samples were taken at roughly weekly intervals after the occurrence of the egg threshold. Yield was determined by harvesting the 2 center rows of each plot (60 row ft per plot) using a commercial 2-row John Deere cotton combine. Lint values were calculated as 37% of total plot weights, assuming 63% was seed and trash. Data were analyzed using ANOVA and LSD statistical procedures.

scholarly journals Selected Insecticides for Control of Corn Earworm and Green Cloverworm in Soybean in Virginia, 1997

1998 ◽  
Vol 23 (1) ◽  
pp. 281-282
Author(s):  
D. A. Herbert
Keyword(s):  
Experimental Design ◽  
Corn Earworm ◽  
Test Area ◽  
Row Spacing ◽  
Statistical Procedures ◽  
Foliar Sprays ◽  
Insect Populations ◽  
Pre Treatment ◽  
Treatment Application ◽  
Sweep Net

Abstract Efficacy of selected insecticides was evaluated against CEW and GCW in soybean. ‘Hutcheson’ soybean was planted 15 June in a producer’s field in Greensville County, VA, using an 18-inch row spacing. All treatments were broadcast as foliar sprays with water on 27 August using a CO2 pressurized backpack sprayer calibrated to deliver 14.3 gpa at 18 psi through 8002VS flat fan nozzles spaced 18 inches apart on the spray boom. A RCB experimental design was used with 4 replicates; plots were 4 rows by 50 ft. Insect samples were taken using a 15-cm diameter sweep net, 15 sweeps per plot. Pre-treatment insect populations were assessed just prior to treatment application by taking several 15-sweep samples throughout the planned test area. Post-treatment samples were taken 2, 4, 8, 12, and 21 days after treatment (DAT) by comparing numbers of small (1st and 2nd instars), medium (3rd and 4th instars), large (5th and 6th instars) and total CEW larvae, and total (all sizes) GCW larvae. Data were analyzing using ANOVA and LSD statistical procedures.

scholarly journals A Risk Index for Determining Insecticide Treatment for Southern Corn Rootworm in Peanut

1997 ◽  
Vol 24 (2) ◽  
pp. 128-134 ◽  
Author(s):  
D. A. Herbert ◽  
W. J. Petka ◽  
R. L. Brandenburg
Keyword(s):  
North Carolina ◽  
South Carolina ◽  
Risk Index ◽  
Production Costs ◽  
Corn Rootworm ◽  
Price Support ◽  
Insecticide Treatment ◽  
Field Case ◽  
Southern Corn Rootworm ◽  
The Individual

Abstract The southern corn rootworm, Diabrotica undecimpunctata howardi Barber, is a primary pest of peanut, Arachis hypogaea L., in Virginia and North Carolina and an occasional pest in South Carolina, Georgia, Alabama, and Texas. Currently, no alternatives involving integrated pest management exist for this pest, and control is based solely on preventive application of soil insecticides. Recent reductions in federal price support for peanut grown in the U.S. have provided incentives for growers to look for ways to reduce production costs. A risk index was developed that integrates factors that influence rootworm abundance and peanut pod damage to estimate levels of risk in individual peanut fields, and thus allows for more prescriptive and economical rootworm management. This index was evaluated using 44 field case studies in Virginia and North Carolina commercial peanut fields over the period 1989 to 1996. In each field case, predicted risk was compared to actual percent pod damage. Results showed that in 29 of 44 cases, the index accurately predicted general levels of risk to pod damage, and insecticide treatment decisions based on the index would have been correct in 32 of 44 cases. This report contains the individual index components, the justification for each, the indexing process, example index scenarios, and results of the process used in field case study evaluation.

Root herbivory: molecular analysis of the maize transcriptome upon infestation by Southern corn rootworm, Diabrotica undecimpunctata howardi

2012 ◽  
Vol 144 (4) ◽  
pp. 303-319 ◽  
Author(s):  
Susan D. Lawrence ◽  
Nicole G. Novak ◽  
Walid El Kayal ◽  
Chelsea J.-T. Ju ◽  
Janice E. K. Cooke
Keyword(s):  
Molecular Analysis ◽  
Corn Rootworm ◽  
Root Herbivory ◽  
Diabrotica Undecimpunctata Howardi ◽  
Southern Corn Rootworm ◽  
Diabrotica Undecimpunctata

Spotted Cucumber Beetle or Southern Corn Rootworm, Diabrotica undecimpunctata Mannerheim (Coleoptera: Chrysomelidae)

2008 ◽  
pp. 3519-3522
Author(s):  
John B. Heppner ◽  
David B. Richman ◽  
Steven E. Naranjo ◽  
Dale Habeck ◽  
Christopher Asaro ◽  
...  
Keyword(s):  
Corn Rootworm ◽  
Southern Corn Rootworm ◽  
Cucumber Beetle ◽  
Diabrotica Undecimpunctata ◽  
Spotted Cucumber Beetle

scholarly journals Spotted cucumber beetle Diabrotica undecimpunctata howardi Barber (Insecta: Coleoptera: Chrysomelidae)

EDIS ◽  
2013 ◽  
Vol 2013 (9) ◽  
Author(s):  
Harsimran Kaur Gill ◽  
Gaurav Goyal ◽  
Jennifer Gillett-Kaufman
Keyword(s):  
North America ◽  
Corn Rootworm ◽  
Agricultural Pest ◽  
Fact Sheet ◽  
Field Crops ◽  
Diabrotica Undecimpunctata Howardi ◽  
Southern Corn Rootworm ◽  
Cucumber Beetle ◽  
Diabrotica Undecimpunctata ◽  
Spotted Cucumber Beetle

Spotted cucumber beetle is a major agricultural pest of North America. Another name for the spotted cucumber beetle is “southern corn rootworm”. Many Diabrotica species cause damage to field crops, especially corn, making these beetles a major agricultural concern. Because of the subterranean nature of their larvae, these insects are hard and expensive to control. This 6-page fact sheet was written by Harsimran Kaur Gill, Gaurav Goyal, and Jennifer Gillett-Kaufman, and published by the UF Department of Entomology and Nematology, September 2013. http://edis.ifas.ufl.edu/in1008

scholarly journals Insect-Mediated Dispersal of the Rhizobacterium Pseudomonas chlororaphis

1998 ◽  
Vol 88 (12) ◽  
pp. 1248-1254 ◽  
Author(s):  
William E. Snyder ◽  
David W. Tonkyn ◽  
Daniel A. Kluepfel
Keyword(s):  
Escherichia Coli ◽  
Adult Stage ◽  
Genetically Modified ◽  
Insect Pest ◽  
Corn Rootworm ◽  
Transmission Route ◽  
Pseudomonas Chlororaphis ◽  
Naturally Occurring ◽  
Southern Corn Rootworm ◽  
Corn Plants

The southern corn rootworm, Diabrotica undecimpunctata subsp. howardi, a common and mobile insect pest, was shown to transmit the rhizobacte-rium Pseudomonas chlororaphis strain L11 between corn plants. Strain L11 has been genetically modified to contain the lacZY genes from Escherichia coli. It can reach high densities on roots and invade the roots and move into the foliage. D. undecimpunctata subsp. howardi became infested with L11 as larvae while feeding on roots of seed-inoculated corn and retained the bacteria through pupation, molting to the adult stage, and emergence from the soil. Bacterial densities on or in the insects increased 100-fold after they fed again as adults on L11-infested foliage. Adults retained the bacteria for at least 2 weeks after last exposure and could transmit L11 to new plants. The likelihood of transmission decreased with time since last exposure to L11, but increased with time spent on the new plants. This research demonstrates that rhizobacteria can escape the rhizosphere by moving in or onto foliage, where they can then be acquired and transmitted by insects. This transmission route may be common among naturally occurring rhizobacteria and facilitate the dispersal of both beneficial and harmful soilborne microorganisms.

Sign in / Sign up

Export Citation Format

Share Document