DENR Plant Disorders (Non-Biological)

Question 1

appears on leaves that undergo prolonged exposure to high

temperature and bright sunlight. Affected areas are light colored, watersoaked and blistered.

Answer 1

Sunscald

Question 2

cause necrotic lesions when deposited on leaf surfaces. When the leaf is fully covered, they may die and fall off.

Answer 2

Particulates

Question 3

cause desiccation, sunscald or leaf scorching on plants, which could be aggravated by drought or insufficient soil moisture.

Answer 3

Hot dry winds

Question 4

may also result in plant disorders.

Answer 4

Flooding and/or excessive soil moisture

Question 5

Lightning may cause breakage of tree branches, which may also cause eventual death of the tree.

Answer 5

Lightning

Question 6

can cause weak, etiolated, spindly plants, which are liable to attack by pathogenic microorganisms. This can also destroy the chlorophyll.

Answer 6

High light intensity