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9 Cards in this Set

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How does temperature effect the development of plant disease?
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
How does moisture effect the development of plant disease?
some fungi thrive is high moisture (i.e.apple leaf spot) while others in low moisture when the plant is stressed (i.e. Fusarium)
How does wind effect the development of plant disease?
dissemination, injure plant surfaces, accelerate drying
How does light effect the development of plant disease?
affects plant growth-- low light-- etiolation
How does soil pH effect the development of plant disease?
some is more severe is lower pH (clubroot of cabbage) while other are more severe in higher pH (potato scab)
How does host plant nutrition affect the development of plant disease?
Nitrogen increase growth but NH4+ lowers soil pH and can increase diseases such as root rots, wilts
How does P, K, Ca, Fe, Cu, an Mn decrease disease?
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
how do herbicides effect the development of plant disease?
Direct-- stimulate or retard pathogen growth or inc or dec in susceptibility of host
Indirect-- increase or dec soil microflora activity
How does air pollution effect the development of plant disease?
Ozone-can reduce growth or rust spores or increase infection of needle blight