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Food quality of spruce needles for forest damaging insects 12. variation in epidermis and hypodermis structure



Food quality of spruce needles for forest damaging insects 12. variation in epidermis and hypodermis structure



Zeitschrift fuer Angewandte Entomologie 88(3): 231-245



Young larvae of certain insects feeding on mature spruce needles usually prefer stomata stripes of needles when penetrating the superficial tissues to get food from the mesophyllum. Resistance of needle surface against attack depends on the structural properties of epidermis and hypodermis. In this investigation on mature Norway spruce needles 2 strengthening structures within stomata stripes were considered, thickness of the outer epidermis cell wall and sclerenchymation of the hypodermis. Variation within single needle, needles of a shoot and shoots of a branch is determined by insertion of a needle, order of shoot, altitude and exposure to light. Genotypes may also differ. Intraindividual variation provides a characteristic pattern of structures within a tree; its effect on insect resistance depends on the behavior of insect species during oviposition or larval migration and determines distribution of larvae over the foliage. Genotypic differences of leaf structures, which cause different degrees of resistance to insects in individual trees, are most important.

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Accession: 005476691

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Related references

On food quality of spruce needles for forest damaging insects. 2. comparative analyses of the compounds in spruce needles and the faeces of larvae of Gilpinia hercyniae Htg. Zeitschrift fur angewandte Entomologie: 70 (4) 386-403, 1972

Food quality of spruce needles for forest damaging insects 14. interrelationships between proteins and phenols after feeding larvae of gilpinia hercyniae hymenoptera diprionidae with spruce needles. Zeitschrift fuer Angewandte Entomologie 90(2): 113-126, 1980

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Food quality of spruce needles for forest damaging insects part 9 influence of needles of the spruce picea abies on glucose 6 phosphate dehydrogenase activity in larvae of gilpinia hercyniae hymenoptera diprionidae. Zeitschrift fuer Angewandte Entomologie 85(4): 379-391, 1978

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