Resource Information

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.

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