Lec21_InsPlant_Interactn

Lec21_InsPlant_Interactn - Insect Plant Interactions...

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Insect Plant Interactions Phytophagous Insects • Monophagous - feed on a single host species or at most a few closely related species within a genus • Oligophagous - utilize hosts belonging to several genera but are usually within a host family • Polyphagous - feed on several host families or orders Approximately 90% of all herbivorous insects have narrow diets, feeding on plants of only one taxonomic family with many species confined to a single host species. Types of Plant Feeding Chewing Insects general consumers leaf skeletonizers leaf miners leaf rollers and leaf tiers borers and girdlers Sucking Insects pierce tissue and extract fluids
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Feeding by Sucking Insects Insertion of the stylets into plant tissue Honeydew In order to obtain the nutrients required for growth and development, sucking insects must imbibe large quantities of plant sap, much of which is passed from the anus essentially unmodified. Honeydew consists largely of water and sugars, and is readily collected by ants, wasps, and bees. Sweet exudate of aphids, leafhoppers, and scale insects. Filter chamber of homopteran Insects as Vectors of Plant Pathogens Insects act as vectors of plant disease organisms, including bacteria, fungi, viruses, and mycoplasmas. Relationships of plant pathogens with insects may be casual, facultative, or obligatory.
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Plant Disease Transmission Plant disease organisms can be spread in 2 ways: Mechanical transmission
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Lec21_InsPlant_Interactn - Insect Plant Interactions...

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