LABORATORY BIOASSAY OF TARNISHED PLANT BUGS FOR THE EVALUATION OF INSECTICIDAL EFFICACY, 1999

Mississippi State University

LABORATORY BIOASSAY OF TARNISHED PLANT BUGS FOR THE EVALUATION OF INSECTICIDAL EFFICACY, 1999

ABSTRACT: Insecticides were evaluated using tarnished plant bug adults caged for 24 h on field-sprayed cotton terminals. All compounds (Furadan 4F, Bidrin 8E, Regent 4SC, Karate 1.8E, Fury 1.5EC, and Orthene 90S) except Steward 1.25SC provided 80 to 90 percent mortality. These 1999 data will contribute towards selecting alternative insecticides for tarnished plant bug management.

INVESTIGATORS: Jack T. Reed and C. S. Jackson

LOCATION: Mississippi State University

YEAR/STATUS: 1999 is the first year of a two year study.

SOIL TYPE: Marietta silt loam

EXPERIMENTAL DESIGN: Randomized complete block with 4 replicates

MATERIALS AND METHODS: Planting date/Seeding rate: 5/17/99, 3 per ft
Variety: BXN 47
Harvest date: (not harvested)
Plot length: 50 ft
Plot width, row spacing : 4 rows, 38 in
Length of buffer at end of plots: 12 ft
Number of untreated rows between plots: 4
Nozzle spacing: 19 in
Application Method: The test was applied with a high clearance spray tractor equipped with a compressed air spray system with 2 TX4 hollow cone nozzles per row. The sprayer was calibrated to deliver 5 gpa at 4 mph and a pressure of 39 psi.
Pesticide application date(s) (does not include insecticide applications not pertinent to the trial): 8/3/99.

RESULTS AND DISCUSSION: Insecticides were applied in the field, and after 30 minutes to allow the insecticide to dry, 10 terminals per plot were cut and placed in water picks and transported to the laboratory. Two adult tarnished plant bugs collected from wild host plants were then placed on each terminal and caged with a ventilated plastic cup. Plant bugs were obtained from Dr. Gordon Snodgrass, USDA, ARS, Stoneville, MS. Mortality was determined at 24 h. Prominent insect species in the trial: Lygus lineolaris (Palisot de Beauvois), tarnished plant bug.

All treatments had greater mortality than the water check. Steward was significantly less efficacious than the other insecticide treatments, however, this compound is reputed to be more effective in the presence of dew which was lacking in the laboratory setting. Mortality may have increased in some treatments had the evaluation been made at 48 h.

Table 1. Results of a field-sprayed laboratory bioassay for tarnished plant bug management. Plant Science Research Farm, Mississippi State, MS, 1999.

Treatment	Lb ai/ac	Percent Mortality	N*
Water		16.9 c	19.5
Steward 1.25 SC	0.11	38.0 b	17.2
Orthene 90 S	0.33	83.3 a	18.8
Orthene 90 S	0.5	81.4 a	18.2
Baythroid 2 EC	0.04	96.0 a	18.5
Fury 1.5 EC	0.045	80.5 a	19.5
Karate 2.08 SC	0.04	87.9 a	19.0
Furadan 4 F	0.25	93.1 a	18.5
Bidrin 8 E	0.4	97.1 a	18.0
Regent 4 SC	0.03	84.5 a	18.5
P(F)<=0.05		0.000	0.405

Means within a column not sharing a common letter differ significantly(P=.05, LSD)
* Mean number of insects per replicate at end of trial.

For information about this page, contact Jack Reed or Chris Jackson.
For information about Mississippi State University, contact msuinfo@ur.msstate.edu.

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