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- Title
PLANT POPULATION STRUCTURE AND APHID PARASITISM: CHANGES IN BARLEY MONOCULTURES AND MIXTURES.
- Authors
Windle, P. N.; Franz, Eldon H.
- Abstract
Two cultivars of barley (Hordeum vulgare L.), one resistant and one susceptible to aphids, were grown in monoculture and in mixtures. Treatments were either infested with aphids (Schizaphis graminum Rond.) or kept free of aphids. The frequency distributions of seed weight, dry weight, and plant height were analysed for three harvests. Seed weight and shoot weight were normally distributed at all harvest. Non-significant departures from normality in shoot weight occurred in those treatments with aphids and these departures were hastened by genetic heterogeneity within the populations. The absence of significant skewness and bimodality was explained on the basis of little variability in relative growth rates among the plants. Plants height was not normally distributed at any 6 period but was significantly skewed and leptokurtic whether or not aphids were present.
- Subjects
APHIDS; CULTIVARS; BARLEY; SEEDS; PLANT growth; PLANT shoots; GREENBUG
- Publication
Journal of Applied Ecology, 1979, Vol 16, Issue 1, p259
- ISSN
0021-8901
- Publication type
Article
- DOI
10.2307/2402745