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The leaves of afflicted trees will usually look yellow, and Although the disease has been studied for more than 60 years, definitive control INTRODUCTION Damage caused by root rot (Phytophthora cinnamomi Rands) to avocado trees (Persea americana Miller) includes wilting, leaf loss, reduced size of fruits that also are more easily exposed to sunburn, and death of roots and branches, with negative impact on production and orchard longevity (BEZUIDENHOUT et al., 1987; BEDENDO, 2011). It can be extremely serious, killing most trees in an orchard. Armillaria root rot infects many crops and native and ornamental plants. Avocado trees are highly susceptible to attack from the water mould Phytophthora cinnamomi that causes phytophthora root rot. Eventually the twigs and stems begin to die, and the leaves fall off. Common hosts include avocado, cherimoya, citrus, and oaks. The roots start getting brittle once they are affected. Phytophthora cinnamomi, the causal agent of avocado phytophthora root rot, attacks the feeder roots, which can result in death of the avocado tree. Avocado Root Rot This is a fungal disease which basically affects the roots of the avocado tree. The treatment Phytophthora root rot is the most destructive and important disease of avocado. In avocado trees, it generally manifests as reduced vigor and overall, generalized decline. Excellent control of Phytophthora root rot was achieved on fully grown avocado trees by injecting agitation for 0.5 hr and was then left to phosethyl-Al twice a year at a rate of 0.4 g a.i./m 2 of canopy area. Nursery plants and young replants are particularly sensitive to root rot and often die soon Armillaria root rot is a widespread disease that afflicts a number of tree species.

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