The  present work represents a study about the biological reserve of the red spider Panonychus  ulmi Koch accomplished to a private fruit-growing farm from the county Sibiu, from a surface of 30 tchick. In order to recomand a treatment against this spyder, we accomplished researches regarding the digital density of the winter eggs layng, on the  unit of the surface/ branches on  lots from the farm. The reserches regarding the digital density of the winter eggs layng pest, were made after the prelevation of 10 cm branches for an easier analize with the maginifing glass binocular. The red acarian  Panonychus ulmi Koch, is a  pholyphagic species frequently pointing out the in orchards fruit-growing  and winegrowing, species of dendrologic plant. Presents 5-6 the generation on year depending on the climatic conditions. Hibernates  in the stage of egg, on branches, around his buds in the cracks barks. The haching of the  larvs  from the hibernante eggs  is in progress when is exceeded the inferior development the shold 8ºC and  is achieved a sum of temperature of 20-50ºC. The female has the oval body the curved dorsal  and when it appears has a brown color. With the time becomes brown to red. The whole body is covered with wintergreens, the one disposed on the dorsal part by-path in number of 26, thread on warts of white color.the body length is variating from 0,3-to 0-5 mm. The male has the oblong body that sharpness on the posterior part.  He is less than female. As much as the female the male  form  male 4 couples of feet. The egg is cepiform, striate dorsal, he is foreseed with a fine pedicel. The winter one has a red shining color, and a diameter of 0,15 mm. The summer one has a yellow color. The larva is red, with three pairs of feet, with a length of 0, 1-0 1-0 2MM. Depending on the attack degree of the prove of analize we recommended the fitosanitare measures of prevention and struggle harmful.

Panonychus ulmi Koch; fruits farm; prevention and control

Presentation: oral