TREE DISEASES AND PESTS
COMMON TREE DISEASES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They reduce the area for photosynthesis.
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They destroy cells.
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They act as a vector, transferring viruses, bacteria and fungi between the plants.
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They prevent plants from acquiring the water and minerals it needs.
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Detailed explanation-1: -Root knot nematodes are sedentary endoparasites penetrating into roots and inducing giant cell formation, usually resulting in root galls. Giant cells and galls disrupt uptake of nutrients and water, and interfere with plant growth. Both dagger and needle nematodes cause slow, gradual decline.
Detailed explanation-2: -Plant parasitic nematodes are microscopic round worms that live in soil and feed on plant roots or foliage. Nematode feeding can result in diseased plants with symptoms such as stunting, yellowing, wilting, yield reduction, root galling and the formation of root lesions.
Detailed explanation-3: -To kill nematodes in soil, heat small quantities of moist soil to 140°F in the oven or by solarization. Heating soil in the oven over a time period needed to bake a medium-sized potato placed in the center of the soil is sufficient to kill nematodes; however, this is only practical for small quantities of soil.