Effects of Mite Population Density on ‘Newtown’ and ‘Golden Delicious’ Apple Tree Performance1

Autor:	R. W. Zwick, G. J. Fields, W. M. Mellenthin
Rok vydání:	1976
Předmět:	Genetics Horticulture
Zdroj:	Journal of the American Society for Horticultural Science. 101:123-125
ISSN:	2327-9788 0003-1062
DOI:	10.21273/jashs.101.2.123
Popis:	Population levels of spider mites, principally European red mite, Panonychus ulmi (Koch), were regulated on ‘Newtown’ and ‘Golden Delicious’ apple trees for 4 years. Seasonal fruit sizing and firmness, terminal shoot growth, leaf chlorophyll content, and folio wing-year fruit set were evaluated against mite feeding intensity. Only leaf chlorophyll content of both cultivars and fruit firmness of ‘Golden Delicious’ were unfavorably influenced by mite feeding. Vigorous-growing, nonstressed apple trees possess a relatively high tolerance to seasonal average mite densities of ca. 30 mites/leaf without adverse effects.
Databáze:	OpenAIRE
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