The influence of SO2-stressed host plants on the development of Bupalus piniarius L. (Lep., Geometridae) and Dendrolimus pini L. (Lep., Lasiocampidae)
1993
Kaetzel, R. (Forstliche Forschungsanstalt Eberswalde, Eberswalde-Finow (Germany). Abt. Waldschutz) | Moeller, K.
The influence of SO2-conditioned food quality alteration on the successful development of the pine needle pests pine looper (Bupalus piniarius L.) and pine spinner (Dendrolimus pini L.) was investigated under laboratory conditions from 1989 to 1991. After a 400-hr sulphur dioxid application (960 mig/cubic yard) the needles of four-year-old pines (Pinus sylvestris L.) show besides an increased sulphur and decreased calcium content significant higher concentrations of free aminoacids especially prolin. The concentrations of glucose and fructose are extremely reduced. Likewise the shape of procyanidins in the needles is diminished by about 24%. The two species of lepidopters show a different sensitivity to the contaminated food. Larvae of B. piniarius, who were fed with Sulphur dioxide - damaged needles, show a delay of larval development together with a diminished biomass rate increase and an increase of mortality. The deterioration of the development success of B. piniarius is attributed above all to the lower carbohydrate concentrations in the needles as well to the nutrient imbalances. In contrast to this result the rate of biomass increase and the mortality of D. pini is significantly reduced. The pine spinner can tolerate the low sugar content of food. That's why the comparatively higher success of development is connected especially with a stress-induced reduction of phenolic needle components
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