Resource Information

     
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. Corry’s Slug and Snail Pellets, Corry’s 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, Corry’s Slug and Snail Pellets, Corry’s 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: Corry’s Slug and Snail Pellets
Manufacturer’s Name: E. M. Matson Jr. Co., Inc.
Address: 7808-8th Ave. South, Seattle, WA 98108
Composition: 2.0% metaldehyde

Product Name: Corry’s Slug and Snail Death
Manufacturer’s Name: E. M. Matson Jr. Co., Inc.
Address: 7808-8th Ave. South, Seattle, WA 98108
Composition: 2.0% metaldehyde

Product Name: Deadline Granules
Manufacturer’s Name: Pace International LP
Address: P.O. Box 558, 500 7th Avenue South, Kirkland, WA 98083
Composition: 4.0% metaldehyde

Product Name: Deadline Bullets
Manufacturer’s 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
Manufacturer’s Name: Platte Chemical Co.
Address: 150 SO. Main Street, Fremont, NE 68025
Composition: 7.5% metaldehyde

Product Name: Ortho Bug-Geta
Manufacturer’s 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
Manufacturer’s Name: Chevron Chemical Co.
Address: San Francisco, CA 94120-7144
Composition: 2.0% 3,5-Dimethyl-4-(methylthio) phenyl methylcarbamate