Abstract— The association of tree species to coffee plantations is a common practice in coffee crops, and studies must be performed to establish the effects of these associations. Pests such as the citrus mealybug, Planococcus citri (Risso), and the pacificus mealybug, Planococcus minor (Maskell) (Hemiptera: Pseudococcidae), can host in several plants and should be studied in relation to this integration. The aim of this study was to evaluate the potential of associated trees to be a source of infestation for coffee crops. The treatments consisted of acrocarpus (Acrocarpus fraxinifolius), African mahogany (Khaya ivorensis), teak plants (Tectona grandis) and macadamia (Macadamia sp.), as well as the coffee tree Coffea Arabica cv. Mundo Novo. Food preference was studied in laboratory through the test of free choice. Mortality, development and reproduction were also evaluated on each host. Attractiveness of these plants towards the coffee tree was tested by means of an olfactometer, whereby the scale insects were exposed for 15 minutes to the odors of these plants. Both scales settled in all tested plants but the trees did not appear to be suitable hosts. High mortality was found on trees. These scales showed no olfactory preference between the coffee tree and the other tested species and teak leaves had even a repellent effect. It is concluded that acrocarpus, mahogany, macadamia and teak are not potential sources of infestation of mealybugs to the coffee tree, and by consequence they do not represent a threat to the crop.
Keywords—Planococcus citri, Planococcus minor, Biology, Food Preference, Olfatometry.
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