Resource Information |
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Evaluation of Molluscicides Against Slugs, Hawaii, 1994 | ||
By: T. Y. Hata, A. H. Hara and B.K.S. Hu
Beaumont Agric. Res. Center, University of Hawaii-Manoa, 461 W.
Lanikaula St., Hilo, Hawaii 96720, Phone (808) 935-2885
TARGETED PEST: Brown slug: Vaginula plebeia (Fischer)
Two-striped slug: Veronicella cubensis (Pfeiffer)
EXPERIMENTAL PROCEDURE
Bioassay tests were conducted from 18 Jan 1994 through 17 Mar
1994 at the University of Hawaii at Manoa, Waiakea Experiment
Station in Hilo, Hawaii. Field collected slugs were held in a
glass aquarium with a screen cover and fed Iceberg
lettuce daily until tests began. A 3 inch thick layer of peat
covered the bottom of the aquarium. Molluscicides were applied at
their recommended label rates to 1 square feet plexiglas cages. A
plexiglas cover with 1/2 inch holes (blocked on one end with
aluminum screen) provided air circulation. Cages were held in a
fiberglass greenhouse. Each cage contained a 1 inch thick layer
of peat moss, a leaf of Iceberg lettuce and half of a
3 inch pot cut longitudinally and pushed partially into the peat
to provide shelter for the slugs during the day. Immediately
after treatment, 10 slugs were added to each cage. Treatments
were replicated four times in time for both species, and
mortality assessed 6 days after treatment. Percentage mortality
were transformed to arcsine squareroot and subjected to analysis
of variance (ANOVA).
RESULTS
All tested molluscicides had significantly higher mortality than
the control for both species. Deadline Granules and Deadline
Bullets were most effective against both species. Corrys
Slug and Snail Pellets, Corrys Slug and Snail Death, and
Ortho Slug-Geta were least effective against V. plebeia. There
was no significant difference in mortality among Ortho Bug-Geta,
Metaldehyde 7.5G, Corrys Slug and Snail Pellets,
Corrys Slug and Snail Death, and Ortho Slug-Geta against V.
cubensis.
Treatment |
Rate/ sq ft. (formulated) |
% Mortality + SE |
|
V. plebeia |
V. cubensis |
||
Deadline Granules |
0.5g |
81.2 + 3.2a |
83.6 + 3.3a |
Deadline Bullets |
0.5g |
76.3 + 1.0a |
65.8 + 1.0ab |
Ortho Bug-Geta |
0.5g |
57.5 + 0.1ab |
41.0 + 2.3bc |
Metaldehyde 7.5G |
0.2g |
47.9 + 1.4bc |
63.1 + 0.8abc |
Corry's Slug and Snail Pellets |
0.3g |
42.3 + 0.2bcd |
44.9 + 1.0bc |
Corry's Slug and Snail Death |
0.3g |
25.9 + 3.9cd |
42.7 + 1.2bc |
Ortho Slug-Geta |
0.5g |
20.3 + 1.9d |
35.9 + 4.8c |
Control |
- |
0.0 + 0.0e |
0.0 + 0.0d |
Percentage mortality transformed to arcsine square root before
ANOVA P< 0.0001. Means followed by different letters in a
column are significantly different by Waller-Duncan K-ratio T
test, Kratio = 100.
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: Corrys Slug and Snail Pellets
Manufacturers Name: E. M. Matson Jr. Co., Inc.
Address: 7808-8th Ave. South, Seattle, WA 98108
Composition: 2.0% metaldehyde
Product Name: Corrys Slug and Snail Death
Manufacturers Name: E. M. Matson Jr. Co., Inc.
Address: 7808-8th Ave. South, Seattle, WA 98108
Composition: 2.0% metaldehyde
Product Name: Deadline Granules
Manufacturers Name: Pace International LP
Address: P.O. Box 558, 500 7th Avenue South, Kirkland, WA 98083
Composition: 4.0% metaldehyde
Product Name: Deadline Bullets
Manufacturers Name: Pace International LP
Address: P.O. Box 558, 500 7th Avenue South, Kirkland, WA 98083
Composition: 4.0% metaldehyde
Product Name: Metaldehyde 7.5G
Manufacturers Name: Platte Chemical Co.
Address: 150 SO. Main Street, Fremont, NE 68025
Composition: 7.5% metaldehyde
Product Name: Ortho Bug-Geta
Manufacturers Name: Chevron Chemical Co.
Address: P.O. Box 5047, San Ramon, CA 94583-0947
Composition: 3.25% metaldehyde
Product Name: Ortho Slug-Geta Snail and Slug Bait
Manufacturers Name: Chevron Chemical Co.
Address: San Francisco, CA 94120-7144
Composition: 2.0% 3,5-Dimethyl-4-(methylthio) phenyl
methylcarbamate