Which of the following are examples of abiotic disease causes?

Which of the following are examples of abiotic disease causes?

• A. Water stress, fertilizer imbalance, temperature extremes, mechanical injury, pollution.
• B. Fungi, bacteria, nematodes, viruses.
• C. Parasitic plants.
• D. Beneficial microbes.

Answer: (A)

Abiotic disease causes are non-living factors in the environment that stress plants and can create disease-like symptoms. Water stress, fertilizer imbalance, temperature extremes, mechanical injury, and pollution all come from the environment or management practices rather than from a living organism, so they fit this category. The other choices involve living things that can cause disease—fungi, bacteria, nematodes, and viruses are pathogens; parasitic plants are living organisms that rely on the host; and beneficial microbes are organisms that generally aid plants rather than cause disease. Since the question asks for abiotic (non-living) factors, the first set is the best example. In practice, recognizing abiotic stress helps distinguish it from biotic disease and informs appropriate management like adjusting irrigation, fertility, or protection from environmental extremes.

Abiotic disease causes are non-living factors in the environment that stress plants and can create disease-like symptoms. Water stress, fertilizer imbalance, temperature extremes, mechanical injury, and pollution all come from the environment or management practices rather than from a living organism, so they fit this category.

The other choices involve living things that can cause disease—fungi, bacteria, nematodes, and viruses are pathogens; parasitic plants are living organisms that rely on the host; and beneficial microbes are organisms that generally aid plants rather than cause disease. Since the question asks for abiotic (non-living) factors, the first set is the best example. In practice, recognizing abiotic stress helps distinguish it from biotic disease and informs appropriate management like adjusting irrigation, fertility, or protection from environmental extremes.