|Phytotoxicity on Dendrobiums, Hawaii, 1990|
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 24 May to 25 Jul 1990 on mature dendrobium orchid plants growing 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, 0.5 lb (AI)/100 gal; and a combination of Orthene 75SP, 1.25 lb (AI)/100 gal + Tame 2.4EC, 0.5 lb (AI)/100 gal. Water was sprayed in control plots. Insecticides were applied until runoff occurred ca 130 gpa using a compressed air sprayer with a No. 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.
Phytoxicity was not observed on the foliage or flowers of treated dendrobium plants.
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