Mijuskovic, M., Tomasevic, B., 1975.
The mites on the citrus trees on the Yugoslav littoral. Titograd, Yugoslavia, Society for Science, Art of Montenegro: 204 p.
Abstract
The principal phytophagous mites found on citrus in the Yugoslav littoral in 1968-72 were Panonychus citri (McG.), Aculops pelekassi (Keifer), Aceria sheldoni (Ewing). A detailed account is given of studies and their bionomics, and other phytophagous and predacious mites found there are also briefly discussed.P. citri, which was first found in Yugoslavia in 1950, is particularly abundant on lemon, it does not enter diapause, and all stages overwinter. About 15 generations develop in a year. In the laboratory, the duration of development from egg to egg at constant temperatures varied from 9 days at 35 deg C to 30 days at 18 deg C. Females laid a maximum of 78 eggs each (average 30.5), the maximum life-span recorded was 69 days, the averages varying under fluctuating temperatures between 43 days in January and 9.25 days in August. Unfertilised females produced eggs from which only males hatched. Natural enemies of P. citri [see RAE/A 64, 4326] included 14 species of predacious mites, several species of predacious insects, fungi and a virus.Aculops pelekassi was first found in Yugoslavia in 1962 and has now spread throughout the citrus-growing area. The mite overwinters in the buds and one generation develops in them in spring, later generations moving to the twigs, young leaves and fruits. In the laboratory, development from egg to egg was completed in 6-7 days at fluctuating summer temperatures and in 8-13 days at fluctuating spring temperatures, at constant temperatures, it lasted 5 days at 35 deg C and 18-19 days at 18 deg C. Between early May and late October, 18-22 generations can develop in the field. Females lived 5-32 days and laid up to 55 (average 31.5) eggs each. No natural enemies were observed.Aceria sheldoni was first observed in Yugoslavia in 1958 but has probably been present in the country for much longer. It is the most injurious of the mites attacking lemon. A generation was completed in about 7 days in summer and 20-30 days in winter. The type of damage it causes is described in detail. It was attacked by various predators, including Typhlodromus pyri Scheuten.Detailed results are presented for all three pest species of tests on chemical control.
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