Environmental Entomology (1981) 10, 645-649

Chris T. Maier (1981)
Seasonal occurrence, abundance, and leaf damage of the apple blotch leafminer, Phyllonorycter crataegella, in Connecticut apple orchards
Environmental Entomology 10 (5), 645-649
Abstract: Populations of the apple blotch leafminer, Phyllonorycter crataegella (Clemens), were sampled in two commercial apple orchards in Connecticut during 1978 and 1979. Each population developed three generations per year. Pupae of the third generation overwintered in fallen apple leaves, and adults emerged in late April and early May. In 1978, moth abundance increased sharply from the second to third flight period even though endosulfan, methomyl, or both were applied in the spring. In 1979, abundance of immatures and adults also increased markedly at the end of the growing season. Rise in population size was accompanied by an increase in the amount of larval food and a decrease in percent parasitism. Tissue feeders destroyed 38.9 and 52.3% of the photosynthetic area of attached and fallen leaves, respectively, collected in a severely infested orchard in October 1979. Impact of parasitism and other factors on populations is discussed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
damage/losses/economics

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phyllonorycter crataegella	Apple (Malus)	U.S.A. (NE)