بررسی کارآیی قارچکش Xedathane 20 (پریمتانیل + روغن میخک) با فرمولاسیون ECبرای کنترل کپک سبز مرکبات (Penicillium digitatum)

Citrus is one of the most important garden products of the country and has been assigned the second rank after apple in this field. During the post-harvest stages, various plant pathogenic agents cause damage to the citrus fruit, which Penicillium digitum is one of the most important causes of damage to citrus fruit. To manage this pathogen, different types of fungicides have been used, but unfortunately, resistance of pathogens to these fungicides has been reported worldwide in recent years. Therefore, it is necessary to develop new fungicides with different effects. In this study, The effectiveness of new fungicide (Xedathane 20), containing (187.2 g/l of pyrimethanil and 185 g/l of clove oil) with EC formulation have been investigated, due to having different effect and also because of its low risk, can be a good alternative to the previous resistant fungicides. To determine the pathogen inhibition rate, the fruits were washed in a fungicide solution. For this purpose, after the transfer of Thomson Nowell cultivar of citrus fruits from the garden to the laboratory and disinfection, scratches on citrus fruit surface were created for pathogen penetration, and after artificial contamination with pathogenic spores containing 106 spores per ml, the fruits were kept at room temperature for 8 h, followed by other treatments. For the investigated fungicide treatments, three concentrations of fungicide were used in proportions of 2, 2.5, and 3 per thousand (The concentration recommended by Middle East Fruit Science Company is 2.5 per thousand). The fruits were Placed in fungicide solution of Iprodione + Carbendazim (Rovral TS) with a concentration of 1:1000 for 120 s, which has previously received the necessary permits for citrus fruits, as a fungicide control treatment, and sterile water was also used as a control treatment. To apply the mentioned treatments; The fruits infected with the pathogen were placed in the solution with the mentioned concentration for 120 s, after which the fruits were kept at room temperature until results were recorded. The experiment was conducted in the form of a randomized complete block design with three replicates and 12 fruits for each replication. All fruit tests were conducted simultaneously in three regions; Amol, Ramsar and Shiraz, and the results were analyzed based on composite data analysis. The results showed that all the fungicide treatments have a significant difference at the level of 5% compared to the water control, but there was no significant difference between the fungicide treatments. Therefore, to manage of this pathogen, it is possible to suggest that Xedathan 20 fungicide at a concentration of two per thousand be used.