Ch 14 Diseases

Which of the following causes noninfectious plant disease?

• Drought

• Insect feeding

• Water droplets containing bacteria

• Viruses

Pathogens, such as bacteria, can passively enter a plant through _______ and ________?

• Through wounds and pores

• Through pores and openings

• Through cracks and crevices

• Through cuts and abrasions

High _______ and moderate _______ is the environment that is the most conducive to plant disease?

• High light and moderate moisture

• High humidity and moderate temperature

• High temperature and moderate wind

• High pressure and moderate light

How do fungi reproduce?

• By releasing chemicals into the environment

• By exchanging genetic material

• By forming fruiting bodies

• Spores

Which of the following is a parasitic plant that is common in Texas?

• Ivy

• Honeysuckle

• Mistletoe

• Cactus

________ and ________ are the colors of light that affect plant growth the most?

• Red and blue

• Green and yellow

• White and black

• Orange and purple

Daily Thermoperiods _____________ _________________ _________________?

• Daily humidity levels

• Daily temperature changes

• Daily wind patterns

• Daily sunlight exposure

What affects the Absorption of macro- and micronutrients?

• Temperature

• Soil composition

• Sunlight intensity

• Water pH

What nutrient affects flower and fruit development?

• Potassium

• Nitrogen

• Phosphorus

• Magnesium

What disease or pest problem is most likely to occur when plants have excess nitrogen?

• Blight

• Scab

• Stippling from mites

• Damage from chewing insects