Soluciones Microbianas del Trópico

Alternarium

It is a genus of filamentous fungi widely distributed in soil and in association with plants. Most species are saprophytes, feed on waste from other agencies, such as dead leaves, dead bodies or excrements.

 

It is characterized by the quick growth producing colonies. Fungal spores are easily recognized under the microscope by its crescent or canoe shape, the formation of the colonies is very variable, and can have two types: one of mycelial type characterized by the production of abundant aerial mycelium cottony with a variable color, white to pinkish peach, but usually with a more intense purple or violet dye on the agar surface and few microconidia, and another colony with little or no formation of aerial mycelium and abundant microconidia.

 

Some of the diseases caused by Fusarium are:

 

Fusarium oxysporum:

It is a cosmopolitan fungus that exists in many pathogenic forms, thanks to the various mechanisms that have to overcome plant defenses. It attacks banana, plantain, tomato, melon, guava, lulo, flowers and many vegetables, colonizing plant ducts, blocking and covering the vascular bundles, which determine the appearance of symptoms of wilting leaf.

 

Fusarium graminearum:

Normally affects cereals such as oats, wheat, barley, etc., if any rain towards the end of the cultivation period. It can also cause root rot and seedling death.

The growth of the infection in the ear depends on weather conditions, especially moisture, which can affect the pin completely or partially. Interrupting a dry period at this stage of the crop can restrict the infection to only part of the ear. The disease occurs in the period of flowering, when it coincides with prolonged periods of rain and temperatures above 20 ° C

RECOMMENDATIONS:

  • Acquire good planting material with phytosanitary quality in nurseries registered by the ICA.
  • Ongoing monitoring to detect in a timely manner diseased trees.
  • Remove dead trees and debris such as logs or stumps.
  • VACCINE applied to the ground, antagonistic microorganisms such as fungi´s complex Trichoderma, in the initial stages of crops.
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