|Phytotoxicity on Dendrobiums, Hawaii, 1991|
By: T. Y. Hata, A. H. Hara, and R. J. Cupples
Beaumont Agri. Res. Center, University of Hawaii-Manoa, 461 W. Lanikaula St., Hilo, Hawaii 96720, Phone (808) 935-2885
DENDROBIUM: Dendrobium Jaquelyn Thomas
Phytotoxicity trials were conducted from 3 May to 28 July 1991 on mature dendrobium orchid plants grown in a fiberglass greenhouse in 1/2 in. crushed basalt rock. Five weekly applications of insecticides were applied at the following rates: Orthene 75SP, 1.25 lb (AI)/100 gal; Tame 2.4EC (CC17228), 0.5 lb (AI)/100 gal; and a combination of Orthene 75SP, 1.25 lb (AI)/100 gal; Tame 2.4EC (CC17228), 0.5 lb (AI)/100 gal. Water was sprayed in control plots. Insecticides were applied until runoff (ca. 130 gpa) using a compressed air sprayer with a 8004 Teejet nozzle at 40 psi. Plants were observed weekly for phytotoxicity continuing for 5 weeks after the last application. Each treatment consisted of 18 plants replicated twice.
Phytotoxicity was not observed on the foliage or flowers of treated dendrobium plants.
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.
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.