96PbField

Mississippi State University

TITLE: EFFICACY OF INSECTICIDES FOR CONTROL OF TARNISHED PLANT BUGS IN COTTON (FIELD TRIAL)

LOCATION: Bellefontaine

REPORT:

GENERAL INFORMATION:

Cotton Variety: NuCottn33 Planting date:

Plot Width: 8 rows Soil Type:

Plot length: 50 feet OM:

Row spacing: 40 %Sand:

Buffer rows between plots: 8 %Clay:

Buffer at end of plots: 10 feet %Silt:

Experimental Design: Randomized complete block, with 4 replications.

Application date Windspeed Temperature (°F) Humidity (%)

8/9/96

Application method: high clearance plot sprayer
Nozzle configuration: Spraying System's TX4, hollow cone nozzles, 19 in spacing
Application parameters: 4 mph; 5 gallons per acre; 39 psi.

Insects present during trial:
Tarnished Plant Bug: Lygus lineolaris (Palisot de Beauvois)

Materials and Methods: This test evaluated the effectiveness of insecticides for control of late season tarnished plant bug in cotton. Sampling consisted of examining visually the number of plant bug adults and nymphs in 25 terminals and squares. Plots within each replicate were sprayed sequentially to maintain true replicate integrity, however two replicates were sprayed one day following the first replicates because of equipment malfunction.

Discussion: Bidrin 8E (0.4 lb [ai]), Fury 1.5EC (0.037 lb [ai]), Karate 1E (0.028 lb [ai]), and Orthene 90S (0.5 lb [ai]) treatments resulted in fewer tarnished plant bugs than the water treated check. The Methyl Parathion treatment was ineffective, resulting in significantly higher numbers of bugs than the Bidrin 8E (0.4 lb [ai]), Fury 1.5EC (0.037 lb [ai]), Karate 1E (0.028 lb [ai]), and Orthene 90S (0.5 lb [ai]), and Dimethoate 4E (0.25 lb [ai]) treatments. These results obtained at the end of the growing season indicate resistance to methyl parathion and poor control from most of the compounds tested. The plant bug population was composed mostly of adults which would be more difficult to control than younger insects. Also, some insecticides in the trial appear to be more efficacious with 2 applications, and such efficacy would not be evident in this trial.

Number Tarnished Plant Bugs / 25 Squares
Treatment	Lb (ai) /Acre	Mean^a

Baythroid 2E	0.033	3.75 a-e
Bidrin 8E	0.4	1.50 e
Capture 2EC	0.06	4.25 a-e
Decis 1.5EC	0.023	4.25 a-e
Dimethoate 4E	0.25	4.50 b-e
Furadan 4F	0.25	4.50 a-e
Fury 1.5EC	0.037	2.50 de
Karate 1E	0.028	1.75 de
Methyl Parathion	0.5	7.00 a
Orthene 90S	0.5	2.25 cde
Provado 70DF	0.045	4.00 a-e
Provado 1.6F	0.125	3.50 a-e
Provado 1.6F	0.045	4.67 a-d
Vydate CLV	0.25	5.50 abc
Water	----	6.50 ab

P>F		0.0525

Means within a column not sharing a common letter differ significantly (LSD; P=0.05).
^a Mean separation based on squareroot transformed data.

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Cotton Variety: NuCottn33	Planting date:
Plot Width: 8 rows	Soil Type:
Plot length: 50 feet	OM:
Row spacing: 40	%Sand:
Buffer rows between plots: 8	%Clay:
Buffer at end of plots: 10 feet	%Silt:

Application date	Windspeed	Temperature (°F)	Humidity (%)
8/9/96