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: -Rose black spot is caused by a fungus which infects roses. It infects leaves and causes black or purple spots on the leaves. The rest of the leaves often turn yellow and drop off the plant. This reduces the plant’s ability to photosynthesise and therefore reduces growth.
Detailed explanation-2: -Black spot (blackspot) is the most important fungal disease of roses worldwide. The initial symptoms start as feathery-edged, black spots on lower leaves. As these spots enlarge, the leaves turn yellow and drop off. The disease continues up the stems until the entire plant becomes defoliated.
Detailed explanation-3: -WHY DOES THIS HAPPEN? There can be a number of reasons why brown or black spots appear on your plant-usually on its leaves. Causes can include: a cold draft combined with too much water, sunburn due to excessive light exposure, overwatering/lack of drainage, insufficient lighting conditions or underwatering.