Abstract
Abstract Phytotoxicity trials were conducted on matured dendrobium orchid plants, grown under 30% polypropylene net shade in no. 3 crushed basalt rock. Four weekly applications of selected insecticides at 4 x the recommended use rate were applied on 6, 13, 20 and 27 Jun to runoff using a compressed air sprayer with a no. 8004 Teejet nozzle at 40 psi. On 18 Jul, raceme length, flower length and the number of flowers per spray were recorded. Racemes were excised from the cane and measured for total length. Flower length was measured from the base of the most matured flower to the base of the youngest flower. Flowers and leaves were observed weekly for phytotoxic symptoms. Each treatment consisted of 12 plants replicated twice.
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