بررسی کارایی کنه‌کش اسپیرودیکلوفن با نام تجاری جدید اینونتور در کنترل کنه تارتن در باغات سیب

Tetranychus urticae Koch, 1836, is one of the most important pests of fruit trees and crops. In order to control this pest, the effect of spirodiclofen 24% SC with new trade name as Inventor® on immature and female adults of two spotted spider mites on apple cultivar golden was investigated in three provinces Tehran (Damavand), Khorasan Razavi and Isfahan. Randomized complete block design was used with four replications (Each replication was consisted of 3 trees) and seven treatments including Spirodiclofen (Inventor®) with two dosage 0.5 and 0.6 L per 1000 L of water, Spirodiclofen (Envidor®) 0.5/1000, Fenazaquin (Pride®) 0.5/1000, Fenpyroximate (Ortus®) 0.5/1000, Diflovidazin (Flumite®) 0.5/1000 and control (Spray with pure water) at 2017. A sampling of 20 leaves was used to assess the mortality rate of target pest from each experimental unit 1 day before and 3, 7, 14 and 21 days after treatment. The active stages of mites at the bottom of the leaves using binoculars device were counted and registered. The mortality rate was calculated by presence and absence of mites before and after spraying. Data obtained from sampling were corrected by Henderson-Tilton formula, then percent mortality of treatments were compared using Duncan grouping method by SAS software. The results showed that there was a significant difference between all treatments with control in all three provinces (P<5%). Results revealed that in Isfahan province, the highest efficiency at all times was related to both concentrations of invertor®. In Damavand, on the 3rd and 7th days both concentrations 0.5 and 0.6 of inventor®, along with two treatments of Envidor® and Pride®, were in the same group with most effective. At 14th day, all treatments except Flumite® treatment (with 57.31% mortality) did not differ significantly and had the most efficiency. On day 21, two concentrations 0.5 and 0.6 of inventor® with 85.9% and 82.03% mortality, respectively, were in the same group with highest efficiency. In Razavi Khorasan province, on the third day, both concentrations of inventor® (100% mortality), envidor® (96.12% mortality) and pride® (100% mortality) were in the same group and were most effective, on the seventh day, both concentrations of inventor ® (96.57 and 100% mortality) and pride® (100% mortality) led to the highest mortality rate and finally on days 14 and 21, the concentration 0.6 of inventor ®and pride® had the highest efficiencies and the concentration 0.5 of inventor ®was in the next rank. Therefore, based on the results of all three provinces, it can be concluded that both concentrations of inventor ®have high efficacy in controlling the two spotted spider mite on apple, and dose 0.5 is recommended for controlling this pest.