By S.A.M.H. Naqvi

One of the Horticultural plants, vegatables and fruits (FV) are of basic - portance because the key resource of crucial elements in an sufficient and balanced human vitamin. FV have supported principally the day-by-day meals requirement of mankind due to the fact that a while or even earlier than guy discovered to develop cereal plants systematically. through the years, becoming FV has been the mainstay of rural economic system and has emerged as an necessary a part of agriculture international over, supplying farmers a variety of plants in assorted topography and weather. In convinced components of the area, FV are the foremost nutritional staple. except being a wealthy resource of nutrients, this region additionally contributes considerably in financial system of the zone or the kingdom. The elevated source of revenue from according to unit region of FV is much forward and will no longer be in comparison with that of cereal vegetation. a up to date survey by means of the Economist printed that the realm inhabitants has - creased by means of ninety % long ago forty years whereas nutrients creation has elevated basically by means of 25 % in keeping with head. With an extra 1. five billion mouth to feed by way of 2020, farmers around the globe need to produce 39 % extra. the burden of the longer term nutrients requirement, the worldwide elevated creation of FV in the course of previous few years has absorbed the extra nutrients requirement and consequently the consuming behavior also are altering and transferring - wards extra intake of those commodities all over the world.

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The cankers can be a few millimeters in diameter or large enough to encompass the entire trunk or branch. The cankers do not favor any particular side of the tree as do those of stem canker caused by P. citricola, where the cankers usually develop on the side closest to the irrigation emitter, which wets the trunk at the site at which the canker develops. Scraping off the bark over the canker reveals shallow reddish brown areas that rarely extend into the cambium. These areas can often be removed easily by prying with a knife blade.

Yearbook, 10:117-119. M. C. 1987. Field occurrence and control of fungi causing postharvest decay of avocados. Phytophylactica, 19:453-455. J. A. 1980. Infectivity studies of avocado sunblotch disease causal agent, possibly a viroid rather than a virus. , 64:313-315. A. A. 1994. Avocado trunk canker disease caused by Phytophthora citricola : investigation of factors affecting infection and disease development. , 78:260-264. A. B. 1994. Comparison of resistance to Phytophthora citricola in nineteen avocado rootstocks under greenhouse conditions.

Citricola, where the cankers usually develop on the side closest to the irrigation emitter, which wets the trunk at the site at which the canker develops. Scraping off the bark over the canker reveals shallow reddish brown areas that rarely extend into the cambium. These areas can often be removed easily by prying with a knife blade. Trees can die from ABS, irrespective of the number or extent of the canker lesions. The lesions appear to be a result of the disorder and not the cause of death. Other symptoms of the disease include chlorosis, early bloom (5-10 days earlier) AVOCADO DISEASES 33 branch die-back, leaf blotching, zinc deficiency, bunchy growth, wilting of foliage and rapid death of new growth (Faber and Ohr, 1999, Zentmyer 1951, Ohr and Murphy 1987, Ohr and Zentmyer 1998b).

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