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9 Cards in this Set
- Front
- Back
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How does temperature effect the development of plant disease?
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Effect fungal growth
Effect number of spores produced and released Affect epidemic development i.e. Late blight is most serious in cool temps; bacterial wilt favors warm temps |
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How does moisture effect the development of plant disease?
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some fungi thrive is high moisture (i.e.apple leaf spot) while others in low moisture when the plant is stressed (i.e. Fusarium)
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How does wind effect the development of plant disease?
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dissemination, injure plant surfaces, accelerate drying
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How does light effect the development of plant disease?
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affects plant growth-- low light-- etiolation
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How does soil pH effect the development of plant disease?
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some is more severe is lower pH (clubroot of cabbage) while other are more severe in higher pH (potato scab)
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How does host plant nutrition affect the development of plant disease?
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Nitrogen increase growth but NH4+ lowers soil pH and can increase diseases such as root rots, wilts
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How does P, K, Ca, Fe, Cu, an Mn decrease disease?
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P-- increase resistance by improving nutrient balance
K-- inc resistance by direct effect on pathogen establishment, wound healing Ca-- effects composition of cell walls enhancing resistance Fe, Cu, and Mn-- plant defense components |
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how do herbicides effect the development of plant disease?
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Direct-- stimulate or retard pathogen growth or inc or dec in susceptibility of host
Indirect-- increase or dec soil microflora activity |
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How does air pollution effect the development of plant disease?
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Ozone-can reduce growth or rust spores or increase infection of needle blight
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