Friday, February 3, 2012

What are the common fig tree diseases?the limbs are dying on mine.i have one live limb left. what can i do?

Fig tree roots are a favorite food of gophers, who can easily kill a large plant. One passive method of control is to plant the tree in a large aviary wire basket. Deer are not particularly attracted to figs, but birds can cause a lot of damage to the fruit. Nematodes, particularly in sandy soils, attack roots, forming galls and stunting the trees. Mitadulid and Carpophilus dried fruit beetles can enter ripening fruit through the eye and cause damage by introducing fungi and rots. They frequently breed in fallen citrus fruits. Keep a clean orchard by destroy fallen fruits and do not grow near citrus trees. Euryphid mites cause little damage but are carriers of mosaic virus from infected to clean trees.



Mosaic virus, formerly considered benign, probably causes crop reduction. Symptoms resemble potassium deficiency--leaves are marbled with yellow spots, and the veins are light colored. Symptoms are often not apparent until the tree is older or when it becomes heat or water-stressed. Do not purchase infected trees and isolate those which show symptoms. Botrytis causes a blast of branch terminals, which dry out and turn charcoal-like. The attack usually starts from half-grown fruits damaged by the first frost of winter, then enters the main stem as a reddish expanding necrotic zone. The infection is generally self-controlling and stops in the spring. It can be prevented by removing mummies and frost damaged fruits as soon as they are observed. Fig canker is a bacterium which enters the trunk at damaged zones, causing necrosis and girdling and loss of branches. It usually starts at sunburned areas, so it is important to keep exposed branches whitewashed. Rhyzopus smut attacks ripened fruits on the tree, causing charcoal black coating inside the fruit, and is worst on cultivars with large, open eyes. Most ripe fruit losses are from Endosepsis (Fusarium) and Aspergillus rot which is introduced by insects, even pollinating wasps. The fruit appears to burst, or a ropy, mucus-like exudate drains from the eye, rendering the fruit are inedible. The best control is to destroy all crop for one year, apply diazinon granules beneath trees to eliminate insect vectors, and destroy adjacent wild trees. Penicillium fungus will attack dried fruits in storage but can be controlled by keeping them dry, or sulfuring before storage.

miriam

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