Control of the rust mite (Calepitrimerus russoi Di Stefano) on laurel
1996
Heungens, A. (Gent Univ. (Belgium). Faculty of Agricultural and Applied Biological Sciences)
A severe natural infestation of the rust mite Calepitrimerus russoi on laurel (Laurus nobilis) was used to evaluate the efficacy of nine pesticides. The mite population primarily consisted of nymphs and larvae, located in the upper part of about one and a half meter high plants. A preliminary experiment showed that a mediated water treatment with a high speed knapsack sprayer removed 70 per cent to 80 per cent of the mites from the plants, preventing them from returning to their host over a short period of time. However, severely infested plants still require the use of pesticides. Choice of the appropriate pesticide is important for economical as well as environmental reasons. Pesticides were applied at recommended rates followed by a second application seven days later. Dramatic differences in control among treatments were observed. Best control was obtained with amitraz, which resulted in no detectable living mites on the plants. Amitraz was followed by bifenthrin and endosulfan. Methomyl and abamectine had a less significant control effect. Omethoate, pyridaben, and pyrol had no effeet and treatment with fenbutatinoxide resulted even in a higher living mite population than the control (water treatment). The results indicate that acaricides and insecticides are more specific than was previously thought. Choice of the appropriate pesticide is important for economical as well as environmental reasons.
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