Effect of plant nourishments on Tetranychus urticae Koch (Acari: Tetranychidae) abundance, in Watermelon Fields of Esfarayen region

Watermelon with a vast area of cultivation is one of the most important products of the North Khorasan Province and the city of Esfarayen. In these areas, Tetranychus urticae can be considered as one of the most important pests of this product; the uncontrolled use of chemical pesticides causes the population to become resistant to pesticides and remains; poisons are very important for their fresh food; Plant nutrition quality hosts a factor influencing pest growth and reproduction. In order to investigate the effect of nutrition in field conditions on different biological stages of T. urticae, an experiment in the form of a randomized complete block design with seven treatments (chicken manure, cow manure, sheep manure, NPK, NPK + Humic acid, Humic acid and control) in Three sampling times were performed in 2015 in Esfarayen city. The results showed that the largest population of T. urticae in chicken manure on biological stages (egg, larva, nymph and adult), respectively, with an average (34.1 ± 27.12, 78.1 ± 04.12, 35.1 ± 04 . 8 and 69.1 ± 73.12) and the lowest number in the NPK + Humic acid fertilizer granulation in biological stages (egg, larva, nymph and adult), respectively (67.0 ± 16.4, 55.0 ± 88.2, 38.0 ± 18.2 and 67.0 ± 07.5) was observed. The results of this research granular fertilizer treatment Humic acid and Humic acid + NPK granulated onion fields in order to control the two-spotted spider mite is considered