Resource Information |
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Control of Thrips on Anthurium, Hawaii, 1992 | ||
By: T.Y. Hata and A.H. Hara
Beaumont Agri Res Center, University of Hawaii-Manoa, 461 W.
Lanikaula Street, Hilo, Hawaii 96720, Phone (808) 935-2885
HOST: Anthurium andraeanum Andre, cv. Ozaki
TARGETED PEST: Anthurium thrips: Chaetanaphothrips orchidii
Moulton
EXPERIMENTAL PROCEDURE
Efficacy trials were conducted from 4 Nov 91 through 29 May 1992.
Mature plants growing in 7.6 liter bags in volcanic cinder media
under 80% polypropylene shade cloth were used in this study.
Experimental plots measured 1.8 by 1.8 m with 36 plants per
block, arranged in a randomized complete block (RCB) with four
blocks. Seven biweekly applications of NTN 240F (33893) were
applied from 5 Nov through 28 Jan to runoff using a compressed
air sprayer with an 8004 Teejet nozzle at 276 KPa. Triton B-1956
was added to NTN 240F and the control at a rate of 0.23 ml per
liter solution. NTN 0.5G (33893) was applied once on 4 Nov and
watered immediately after treatment. Anthurium flowers were
harvested biweekly at 3/4 to full maturity and observed for
thrips injury characterized by distinct bleached streaks on the
front and/or back of the spathe. Pre-treatment data was taken on
11 and 25 Oct. Biweekly data were pooled for analysis.
RESULTS
NTN 0.5G significantly reduced the percentage of flowers
harvested with thrips injury for 5 months. There was no
significant difference between NTN 240F and the control except in
Mar. Anthurium thrips feed within the flower bud soon after the
bud emerges from the leaf axial. Thrips injured flowers observed
in Dec were the result of feeding injury to the bud which
occurred in Nov. Phytotoxicity was not observed with both
formulations of NTN.
Table 1. Percent of harvested anthurium flowers with thrips
injury.
Pretrt.
AI | Oct | Nov | Dec | Jan | Feb | Mar | April | May | Jun | Jul | Aug |
NTN 0.5%G 0.06g/pot | 77.3a | 75.3a | 50.0a | 6.5a | 1.8b* | 2.3a** | 14.9b* | 24.7b* | 34.0b** | 48.4ab* | 48.5a |
NTN 240F 5.6g/100gal | 83.6a | 86.6a | 71.0a | 27.2a | 25.8ab | 32.8b | 42.0ab | 78.1a | 90.0a | 82.5a | 40.6a |
Control | 81.5a | 91.7a | 61.0a | 56.7a | 62.3a | 69.7c | 74.2a | 85.3a | 74.3a | 41.7b | 21.6a |
Percentages transformed to arcsine and subjected to Bartlett's
test for homogeneity. Transformed data subjected to ANOVA
P<0.05, P<0.01, *, **, respectively. Means followed by the
same letter in a column are not significantly different by
Scheffe's multiple comparison procedure.
PRODUCT INFORMATION
Product Name: NTN 33893 0.5%G
Manufacturer's Name: Miles Inc.
Address: P.O. Box 4913, 8400 Hawthorn Road Kansas City, MO 64120
Composition: imidacloprid 0.5%G
Product Name: NTN 33893 240F
Manufacturer's Name: Miles Inc.
Address: P.O. Box 4913, 8400 Hawthorn Road Kansas City, MO 64120
Composition: imidacloprid 2.0 lb active per gallon
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.