Resource Information
Resource Information |
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| Control of Orchid Weevils on Dendrobium, Hawaii, 1993 | |
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By: T. Y. Hata and A. H. Hara
Beaumont Agri. Res. Center, University of Hawaii-Manoa, 461 W.
Lanikaula St., Hilo, Hawaii 96720, Phone (808) 935-2885, Fax
(808) 969-7923
HOST: Dendrobium Orchid, Dendrobium 'Uniwai Supreme'
TARGETED PEST: Orchid weevil: Orchidophilus aterrimus
(Waterhouse)
EXPERIMENTAL PROCEDURE
Bioassay tests were conducted from 10 Mar. through 8 Apr. 1993 at
the University of Hawaii at Manoa, Waiakea Experiment Station in
Hilo, HI. Established plants growing in 1.27 cm 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 to runoff (approximately 1,375 liters/ha) using
a compressed air sprayer with a 8004 Teejet nozzle at 276 KPa.
Seven, 14 and 21 days after treatment (DAT), 16 leaves per
treatment, 4 leaves per rep, were removed from the plant and
placed into 12.0 x 10.5 cm unwaxed paper containers. Ten orchid
weevils collected on bamboo orchids, Arundina graminifolia (D.
Don) Hochr. was added to each replicate and covered with organdy.
Mortality and the number of feeding marks were assessed 1, 5, and
8 days after days after exposure (DAE).
RESULTS
All treatments had significantly higher mortality than the
control. Talstar was most effective, killing all weevils at 7,
14, and 21DAT within 5 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 response to the insecticide. In
addition, all treated leaves had significantly less feeding
injury 5 DAE as compared to the control.
Table 1. Percentage mortality of orchid weevils and feeding
injury 1, 5 and 8 days after exposure to residue on leaves
harvested weekly after one insecticide application.
| 7DATa | (g) AI/liter | 1 DAEb | Injury | 5 DAE | Injury | 8 DAE | Injury |
| Talstar F | 0.20 | 92.5(a)*** | 11.5(b)** | 100.0(a)*** | 0.0(b)*** | 100.0(a)*** | 0.0(b)*** |
| Tame 2.4EC | 0.20 | 0.6(b) | 37.5(a) | 45.0(c) | 28.8(b) | 60.6(b) | 24.5(b) |
| Tempo 2EC | 0.04 | 13.5(b) | 9.3(b) | 78.4(b) | 8.8(b) | 94.7(a) | 1.0(b) |
| Control | -- | 0.0(b) | 33.3(a) | 0.0(d) | 143.0(a) | 0.0(c) | 131.5(a) |
| 14DAT | (g) AI/liter | 1 DAE | Injury | 5 DAE | Injury | 8 DAE | Injury |
| Talstar F | 0.20 | 98.7(a)*** | 14.8(b)** | 100.0(a)*** | 0.0(b)*** | 100.0(a)*** | 0.0(aNS) |
| Tame 2.4EC | 0.20 | 2.6(b) | 31.3(b) | 39.8(b) | 58.3(b) | 44.9(b) | 30.3(a) |
| Tempo 2EC | 0.04 | 0.6(b) | 42.5(ab) | 34.6(b) | 51.0(b) | 39.8(b) | 15.5(a) |
| Control | -- | 0.0(b) | 64.8(a) | 0.0(c) | 222.5(a) | 0.0(c) | 50.5(a) |
| 21DAT | (g) AI/liter | 1 DAE | Injury | 5 DAE | Injury | 8 DAE | Injury |
| Talstar F | 0.20 | 72.4(a)*** | 13.5(b)** | 100.0(a)*** | 0.3(b)** | 100.0(a)*** | 0.0(c)** |
| Tame 2.4EC | 0.20 | 0.0(b) | 47.8(a) | 5.7(bc) | 102.3(b) | 5.7(bc) | 113.8(ab) |
| Tempo 2EC | 0.04 | 2.6(b) | 55.3(a) | 24.0(b) | 41.3(b) | 23.3(b) | 42.8(bc) |
| Control | -- | 0.0(b) | 36.8(ab) | 0.0(c) | 224.3(a) | 0.0(c) | 165.8(a) |
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.
(a) Days after treatment.
(b) Days after exposure.
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 Ib 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 Ib 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 Ib active per gallon