Resource Information |
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Postharvest Insecticidal Dips for Control of Thrips on Dendrobium, 1992 | ||
By: T. Y. Hata, A. H. Hara and Ben K.S. Hu
Beaumont Agri. Res. Center, University of Hawaii-Manoa, 461 W.
Lanikaula St., Hilo, Hawaii 96720, Phone (808) 935-2885
HOST: Dendrobium Orchid: Dendrobium cv. Uniwai
Princess
TARGETED PEST: Frankliniella occidentalis (Pergande)
EXPERIMENTAL PROCEDURE
Postharvest insecticidal dips were evaluated in Apr. 1992 at the
University of Hawaii Waiakea Experiment Station in Hilo, Hawaii.
Flowers were harvested from a commercial dendrobium farm in
Kailua-Kona, Hawaii. Dendrobium plants were well established
growing in 1/2" crushed basalt rock under 30% polypropylene
shade using standard cultural practices. Prior to harvest
inflorescences were visually inspected for the presence of
thrips. Only infested inflorescences were selected for testing.
Treatments consisted of 3 replicates, with 5 inflorescences per
replicate. Each replicate was dipped floral end first into 19
liter buckets containing the insecticide solutions. Control
inflorescences were dipped in water. Inflorescences were
submerged for 3 minutes, and gently agitated 10 times at
emergence, at 1.5 minutes and again before removal for a total of
30 times. After dipping, inflorescences were placed into buckets
and allowed to air dry. Twenty-four hours after treatment,
blossoms were removed from the inflorescences, counted, and
placed in berlese funnels heated with a 60 watt incandescent
light bulb. Thrips were collected in a 8:2:1:1 solution of
ethanol, distilled H2O, acetic acid and glycerin. The number of
nymphs and adults were counted. Because the number of blossoms
per inflorescences varied, thrips counts were adjusted to the
number of thrips per blossom by dividing the total number of
thrips recovered by the total number of blossoms.
RESULTS
All treatments had significantly less thrips per blossom than the
control. Dursban 4E and Avid 0.15EC were most effective followed
by the Mavrik Aquaflow/Incite combination, Pageant DF and Mavrik
Aquaflow. There was no significant difference among Dursban 4E,
Avid 0.15EC, Mavrik Aquaflow/Incite and Pageant DF. Dursban 4E
treated flowers had a detectable odor after treatment.
Study 1
Treatment | AI (g/liter) | Thrips/blossom |
Mavrik Aquaflow | 0.1 | 0.50b |
Pageant DF | 0.7 | 0.21bc |
Mavrik/Incite | 0.1/0.6 | 0.16bc |
Avid 0.15EC | 0.6 | 0.11c |
Dursban 4E | 0.01 | 0.09c |
Control | - | 1.10a |
Data transformed to log10(x+1) and subjected to ANOVA (P <
0.01). Means followed by the different letters in a column are
significantly different by Waller-Duncan K-Ratio T test.
PRODUCT INFORMATION
CAUTION
"Hawai'i pesticide law prohibits the use of many
insecticides as dips or drenches. Pesticide labels which prohibit
dip usage or state the amount of product to be used per acre
cannot be legally used as dips. Used dip solutions should be
disposed by applying to approved crops or site in accordance with
all label directions. Contact the Hawaii Department of
Agriculture, Pesticide Branch if in doubt about legal use and
proper disposal of insecticide dip solutions."
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: Mavrik Aquaflow
Manufacturer's Name: Sandoz Crop Protection Corp.
Address: 1300 E. Touhy Ave., Des Plaines, IL 60018
Composition: fluvalinate 2.0 lb active per gallon
Product Name: Pageant DF
Manufacturer's Name: Dow Chemical U.S.A.
Address: P.O. Box 1706, Midland, MI 48640
Composition: chlorpyrifos 50%
Product Name: Incite
Manufacturer's Name: Loveland Industries Inc.
Address: P.O. Box 1289, Greeley, CO 80632
Composition: Piperonyl Butoxide 8.0 lb active per gallon
Product Name: Avid 0.15EC
Manufacturer's Name: MSD Ag Vet.
Address: P.O. Box 2000, Rahway, NJ 07065
Composition: avermectin B1 0.15 lb active per gallon
Product Name: Dursban 4E
Manufacturer's Name: Dow Chemical U.S.A.
Address: P.O. Box 1706, Midland, MI 48640
Composition: chlorpyrifos 4.0 lb active per gallon