Journal of the American Society for Horticultural Science · 1990
Nitrogen Fertilization Influences the Physiology of Apple Leaves Subjected to European Red Mite Feeding
Campbell, R. J., Marini, R. P.
Abstract
The interaction of N fertilization and European red mite (ERM) [Panonychus ulmi (Koch)] feeding on the physiology of greenhouse-grown `Imperial Delicious' apple (Malus domestica Borkh.) leaves was evaluated. Visual damage was noticeable with 75 mite days (MD) and was consistently greatest on the low-N leaves. Net photosynthesis (Pn) was decreased by mite feeding in all N treatments. However, with equal MD, the high-N treatment retained higher Pn than the low- or medium-N treatments. Transpiration, dark respiration, leaf N, and total chlorophyll increased with N and were reduced by mite feeding. Mite feeding increased dark transpiration at all N levels. Relative water content was unaffected by N and was reduced by mite feeding. Specific leaf weight increased with N and MD.
Findings
What changed what, as the paper reports it. Grouped by the measured property. The largest groups are open; open the others as you need them.
net photosynthesis (Pn)
↓ 13
- decrease
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