بررسی تغییرات جمعیت کنه قرمز مرکبات Panonychus citri (McGregor) (Acari: Tetranychidae) روی پرتقال تامسون ناول

Among the citrus pests, citrus red mite (CRM) Panonychus citri (McGregor) (Acari: Tetranychidae) is one of the key pests of citrus orchards in many parts of the world. To investigate seasonal variations of CRM on Thomson navel orange leaf (Citrus sinensis cv. Thomson navel), this research was conducted during 2016-2017 at Ghaemshahr Horticulture Research Station. The experiment was based on a randomized complete block design on the same age trees of Thomson Novel oranges with 1 control treatment (without CRM control) and 4 treatments for artificial pollution with CRM (weekly and one treatment per week) in 4 repetitions. The results of the analysis of the population of different stages of the age of CRM in 2016 showed that the highest population of CRM in the control treatments was recorded on 8set of July, treatment 1 on 17set of August, treatment 2 on 17set of August, treatment 3 on 23set of August and treatment 4 on 1set August and the population of different stages of age of CRM were 2.40 ± 1.45, 5.95, 1.75 ± 1.75, 35.10 ± 12.66 and 15.91 ± 6.33 respectively in per leaf. Also, the results of analysis of variance of CRM data in 2017 showed that the highest population of this pest belonged to treatments 2 on 21set of August, treatment 3 on 21set of August and treatment 4 on 25set of July. The population of different stages of age of CRM were 9.59 ± 9.09, 46.5 ± 16.1 and 127 ± 14 in per leaf, respectively. Therefore, according to the results of this experiment, the population of different stages of the age of the CRM peak at the end of June and also in the months of July, August and September, and this number was never repeated until the end of the sampling. So that the population of different stages of age of CRM from the end of September was gradually subsided and this population did not differ significantly in treatments, and comparison of means of different stages of the age of this pest is not significant.