<p>The scabies of the apple tree Venturia inaequalis is one of the most important illnesses at world level. Annually, millions of dollars are invested in the purchase and pulverization of fungicides for their control. The fungus is highly prevalent in areas with high pluviometry and favorable conditions for its development, added to the great susceptibility of cultivated varieties. It is important to know its biology, development and handling, aspects captured in the article as subjects of reflection and analysis in the scientific investigation. The above-mentioned, due to fruit trees constitute an economic sector with a permanent bigger importance in the development of the agricultural sector of our country.</p>