Radioactive measurement of brown mite injury on avocados
Dual-isotope porometer correlates mite feeding with reduced transpiration and photosynthesis rates. Avocado brown mite can reach high population densities in southern California avocado-growing areas with a coastal or intermediate climate. Its feeding on avocado leaves is initially confined to the area surrounding the midrib on the upper leaf surface. Later, feeding extends along the smaller veins and may eventually cover the entire leaf if mite densities become high. The upper surfaces of recently expanded avocado leaves are the most favorable for adult survival, population increase, egg-laying, and development of immatures as compared with new leaves and the lower surfaces of mature leaves. Many workers have also observed that the accumulation of webbing and mite cast skins on the leaves can limit brown mite population growth.
| Main Authors: | , , , , , |
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| Format: | Texto biblioteca |
| Language: | spa |
| Published: |
California (EUA) Universidad de California
1982
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| Subjects: | PERSEA AMERICANA, OLIGONYCHUS PUNICAE, PLAGAS DE PLANTAS, DAÑOS, RESPUESTA DE LA PLANTA, FISIOLOGIA VEGETAL, AGUACATE, ARBOLES, AGRICULTURA, PLAGAS FORESTALES, ACAROS DAÑINOS, |
| Online Access: | https://calag.ucanr.edu/archive/?type=pdf&article=ca.v036n05p22 |
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| Summary: | Dual-isotope porometer correlates mite feeding with reduced transpiration and photosynthesis rates. Avocado brown mite can reach high population densities in southern California avocado-growing areas with a coastal or intermediate climate. Its feeding on avocado leaves is initially confined to the area surrounding the midrib on the upper leaf surface. Later, feeding extends along the smaller veins and may eventually cover the entire leaf if mite densities become high. The upper surfaces of recently expanded avocado leaves are the most favorable for adult survival, population increase, egg-laying, and development of immatures as compared with new leaves and the lower surfaces of mature leaves. Many workers have also observed that the accumulation of webbing and mite cast skins on the leaves can limit brown mite population growth. |
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