Resource Information

     
Evaluation of Pyrethroids Against Thrips on Anthurium, 1993  
     

By: T. Y. Hata and A. H. Hara

Beaumont Agri. Res. Center, University of Hawaii-Manoa, 461 W. Lanikaula Street, Hilo, Hawaii 96720, Phone (808) 935-2885

HOST: ANTHURIUM: Anthurium andraeanum Andre , 'Ozaki'
TARGETED PEST: Anthurium thrips: Chaetanaphothrips orchidii Moulton


EXPERIMENTAL PROCEDURE
Efficacy trials were conducted from 4 May through 12 Jul 1993 at the University of Hawaii at Manoa, Waiakea Experiment Station in Hilo, HI. Matured plants growing in 2 gal bags in volcanic cinder media under 80% polypropylene shade were used in this study. Experimental plots measured 6 by 6 ft with 36 plants per block, arranged in a randomized complete block (RCB) with four blocks. Four biweekly applications of insecticides were applied beginning 4 May ending 28 Jun. Insecticides were applied at 1,846 liters/ha using a compressed air sprayer equipped with an 8004 Teejet nozzle at 40 psi. A spreader-sticker (Ad-here, Occidental Chemical Co., Lanthrop, CA) was added to all treatments including the control at a rate of 0.39 ml/liter solution. The control was sprayed with water. Anthurium flowers were harvested biweekly at 3/4 to full maturity and observed for thrips injury characterized by distinct bleached streaks on the front and/or back of the spathe. The percentage of thrips injured flowers were analyzed by analysis of variance (ANOVA).

RESULTS
Tempo and Tame significantly reduced the percentage of thrips injured flowers as compared with the control. There was no significant difference among the three tested insecticides. Anthurium thrips feed within the flower bud soon after the bud emerges from the leaf axial. Thrips injured flowers observed in the latter part of May and early June were the result of feeding injury to the bud which occurred in early May. Phytotoxicity to flowers or leaves was not observed with any treatments.

  Percentage of flowers with thrips injury  
   

a

   

Treatment

AI (g/liter)

4-May

14-Jun

28-Jun

Talstar F

0.2

96.5a

64.5a

10.9ab*

Tempo 2EC

0.04

90.6a

69.3a

0.8b

Tame 2.4EC

0.2

94.7a

65.7a

2.9b

Control

--

90.7a

71.7a

33.1a


Percentages transformed to arcsine and subjected to ANOVA (*, P<0.05). Means followed by different letters in a column are significantly different by Waller-Duncan K-ratio t test, k=100.
a Pre-treatment data.

PRODUCT INFORMATION

PRECAUTIONARY STATEMENT
Use pesticides safely. Follow the pesticide label. Consult with the Cooperative Extension Service or the Hawai'i State Department of Agriculture for authorized special local need registrations or additional information. The user is responsible for the proper use, application, storage, and disposal of pesticides.

DISCLAIMER
Reference to a company or product name does not imply approval or recommendation of the product by the College of Tropical Agriculture and Human Resources, Cooperative Extension Service University of Hawaii, or the United State Department of Agriculture and does not imply its approval to the exclusion of other products that may be suitable. All materials should be used in accordance with label instructions or manufacturer's directions.

Product Name: Talstar Flowable
Manufacturer's Name: FMC Corp.
Address: 2000 Market Street, Philadelphia, PA 19103
Composition: bifenthrin 0.67 lb active per gallon

Product Name: Tame 2.4EC
Manufacturer's Name: Valent U.S.A. Corporation
Address: 1333 No. California St., Walnut Creek, CA 94598
Composition: fenpropathrin 2.4 lb active per gallon

Product Name: Tempo 2EC
Manufacturer's Name: Miles Inc.
Address: P.O. Box 4913, 8400 Hawthorn Road, Kansas City, MO 64120
Composition: cyfluthrin 2.0 lb active per gallon