| Autor: |
Kreitner, Gerald, Rogers, Charlie E. |
| Zdroj: |
Annals of the Entomological Society of America; September 1981, Vol. 74 Issue: 5 p431-431, 1p |
| Abstrakt: |
Helianthus annum L. seeds infested by larvae of the sunflower seed midge, Neolasioptera helianthi (= murtfeldtiana) (Felt), develop an abnormally colored and soft pericarp. Larvae are accompanied by an unidentified fungus in infested seeds. Normal-appearing seeds are dark, hard, and contain neither larvae nor fungus. It appears that successful infestation of seeds by the sunflower seed midge depends upon the accompanying fungus infection. Microscopic observations indicate that midge larval penetration and fungal infection of seeds occur at an early stage of differentiation and maturation of the pericarp. Seeds harboring larvae and fungi experience <50% reduction in sclerification of the sclerenchyma and incomplete filling of hypodermal cells. Also, the inner pericarp wall of infested-infected seeds are penetrated by fungal mycelium, where hyphae obliterate phloem cells in the vascular bundles. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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