Resource Information |
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Residual Activity of Insecticides on Dendrobium for Control of Orchid Weevils, 1993 | ||
By: A. H. Hara and T. Y. Hata
Beaumont Agri. Res. Center, University of Hawaii-Manoa, 461 W.
Lanikaula St., Hilo, Hawaii 96720, Phone (808) 935-2885
HOST: Dendrobium Orchid: Dendrobium 'Uniwai Supreme', 'Uniwai
Pearl'
TARGETED PEST: Orchid weevil: Orchidophilus aterrimus(Waterhouse)
EXPERIMENTAL PROCEDURE
Bioassay tests were conducted from 10 Mar through 8 Apr 1993
(study 1) and 31 Aug through 22 Sep 1993 (study 2) at the
University of Hawaii at Manoa, Waiakea Experiment Station in
Hilo, HI. Established plants 'Uniwai Supreme' (study 1), and
'Uniwai Pearl' (study 2) growing in 0.5 inch crushed basalt rock
under a Conley cold frame greenhouse (6 mil. clear FVG 3HLFI
polyethylene film covering) were used in this study. Insecticides
were applied once at 1,375 liters/ha using a compressed air
sprayer with a 8004 Teejet nozzle at 40 psi. Sixteen leaves per
treatment, 4 leaves per replicate, were removed weekly from the
plant and placed into 12.0 x 10.5 cm unwaxed paper containers.
Ten orchid weevils field collected on bamboo orchids, Arundina
graminifolia (D. Don) Hochr. was added to each replicate and
covered with organdy. In study 1, leaves were bioassayed 7, 14,
and 21 d after treatment and mortality and the number of feeding
marks (injury) assessed 5 d after exposure. In study 2, leaves
were bioassayed 7 and 14 d after treatment and mortality and
injury assessed 2 d after exposure.
RESULTS
In study 1, all treatments had significantly higher mortality
than the control. Talstar was most effective, killing all weevils
at 7, 14, and 21 days after treatment (DAT) within 5 days after
exposure (DAE). Tempo, and Tame caused < 24% mortality at 21
DAT. There was no significant difference between Tempo and Tame,
14 and 21 DAT. Immediately after exposure, orchid weevils in all
insecticide treatments were observed crawling on the top of the
container. This behavior was not observed in the control and
apparently was a repellent action of the insecticide. In
addition, all treated leaves had significantly less feeding
injury 5 DAE as compared to the control. In study 2, Talstar had
significantly higher mortality than Pageant and the control.
There was no significant difference in feeding injury between
Talstar and Pageant.
Study1 | (g) AI/liter | 7 DATa % mort. |
feeding injury | 14 DATa % mort. |
feeding injury | 21 DATa % mort. |
feeding injury |
Talstar F | 0.20 | 100.0a*** | 0.0b*** | 100.0a*** | 0.0b*** | 100.0a*** | 0.3b** |
Tame 2.4EC | 0.20 | 45.0c | 28.8b | 39.8b | 58.3b | 5.7bc | 102.3b |
Tempo 2EC | 0.04 | 78.4b | 8.8b | 34.6b | 51.0b | 24.0b | 41.3b |
Control | -- | 0.0d | 143.0a | 0.0c | 222.5a | 0.0c | 224.3a |
Study 2 | (g) AI/liter | 7 DATa % mort. |
feeding injury | 14 DATa % mort. |
feeding injury | ||
Talstar F | 0.20 | 92.5a*** | 1.0b** | 92.5a*** | 2.5b* | ||
Pageant DF | 0.60 | 2.6b | 48.3ab | 2.1b | 50.3ab | ||
Control | -- | 0.0b | 108.5a | 0.0b | 100.5a |
Percentage mortality transformed to arcsine(sqrt) before
analysis. NS, *, **, ***, not significant or significant by anova
P< 0.05, 0.01, 0.0001, respectively. Means followed by the
same letter in a column are not significantly different by
Scheffe's multiple comparison procedure.
aDays after treatment. Mortality and feeding injury assessed 5 d
and 2 d after exposure in studies 1 and 2, respectively.
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: Pageant DF
Manufacturer's Name: DowElanco
Address: 9002 Purdue Rd., Indianapolis, IN 46268-1189
Composition: chlorpyrifos 50%
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