. Annual report. Entomological Society of Ontario; Insect pests; Insects. SOCIETY OF ONTARIO 29 Phytoseiid females have been seen crawling on the bark scales during the warmer days of late winter and early spring, and have been found running about on the green buds by the middle of May. Egg laying commences about the end of May. As yet, no males of any species have been found MAY JUNE JULY AUG- SEPT. OCT. Fig. 1. Population trend of phytoseiid3 on peripheral leaf clusters for 1951. Laboratory Studies.—So far, laboratory studies have been largely confined to the species T. falla
. Annual report. Entomological Society of Ontario; Insect pests; Insects. SOCIETY OF ONTARIO 29 Phytoseiid females have been seen crawling on the bark scales during the warmer days of late winter and early spring, and have been found running about on the green buds by the middle of May. Egg laying commences about the end of May. As yet, no males of any species have been found MAY JUNE JULY AUG- SEPT. OCT. Fig. 1. Population trend of phytoseiid3 on peripheral leaf clusters for 1951. Laboratory Studies.—So far, laboratory studies have been largely confined to the species T. fallacis Garm. Six generations were reared at a temperature of 70( + 2)°F. and a relative huirrdity of about 79 per cent. Eggs of the first generation were deposited by an overwintering female. Thp incubation period lasted 3 to 4 days, the nymphal period about 1 day, and the larval period 3 to 4 days. The total time from hatching to adult was from 5 to 6 days, and the pre- oviposition period 7 to 8 days. The longevity recorded for the females was 30 to 65 days, and for the males 10 to 24 days. On the average, a total of eggs, or eggs per day, were laid. The female is fertilized in the adult stage; one male may fertilize more than one female. As yet, parthenogenetic development has not been observed. REFERENCES Bare, C. O. 1942. Some natural enemies of stored-tobacco insects with biological notes. J. Econ. Ent. 35: 185-189. Garman, P. 1948. Mite species from apple trees in Connecticut. Connecticut Agr. Expt. Sta. Bull. 520. Lord, F. T. 1949. The influence of spray programs on the fauna of apple orchards in Nova Scotia III. Mites and their predators. Canadian Ent. 81:202-214; 217-230. MacPhee, A. W. 1953. The influence of spray programs on the fauna of apple orchards in Nova Scotia. V. The predacious thrips Haplothrips faurei Hood. Canadian Ent. 85: 33, Nesijitt, H. 1951. A taxonomic study of the Phytoseiinae (Family Laelaptidae) predacious upon Tetranychidae of econo
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