The effect of once spring application of Calcium, Zinc and Urea on population density of common pistachio psylla Agonoscena pistaciae (Hem: Aphalaridae) in pistachio orchards of Rafsanjan

Document Type : Research Paper

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Abstract

The common pistachio psylla, Agonoscena pistaciae Burckhardt and Lauterer (Hem.: Aphalaridae) is one of the most important pests of pistachio trees in Iran. Cultural methods such as crop fertilization can affect susceptibility of plants to insect pests attack by altering plant tissue nutrient levels. In this investigation we studied in relation to varying fertilization levels of Ca, U, Zn and amitraz on common pistachio psylla, A. pistaciae in pistachio orchards based on complete randomized blocks with six replications and nine treatments including applied Ca, U, Zn, Uzn, Uca, ZnCa, UZnCa, amitraz and control on common pistachio psylla fed on 20-year-old pistachio trees of Ahmadaghaei rootstock in Rafsanjan orchards. The results showed that the effect of nutrient solution on nymph and eggs population had a significant difference at %1 and 5% level, respectively. The highest measure of control on eggs was related to UZnCa while the least was related to ZnCa and amitraz. The results also showed that the highest measure of pest control was related to Ca while the least was related to amitraz and UZn. The results indicated that the elements mentioned had a stronger reducing effect on the concentration of common pistachio psylla nymphs than the effect pesticide had.

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History

  • Receive Date: 02 July 2015
  • Accept Date: 02 July 2015

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