Studying the Effect of Liquid Sulfur SC 80% on Cotton Spider Mite <i>Tetranychus Urticae</i> (Koch) in Cotton Fields of Golestan Province

Cotton is attacked by several harmful factors during its growth period, the importance of each of them depends on the cultivar, climate and various agricultural and biological factors. Seed rot, seedling death, cotton thrips, aphids, bollworms, mites, leafhoppers, and whitefly are the most common damaging factors in the Iran. The use of sulfur formulations is very important for the management of diseases and pests. In this project, the effect of liquid sulfur on reducing the damage caused by the spider mite, one of the important damaging factors in cotton fields, was carried out with 6 treatments in 4 replications at Hashmabad cotton research station in Gorgan in 2022-2023. The obtained results show that liquid sulfur treatment with a dose of 4 per thousand per hectare after 7 to 10 days of spraying with an average of 56-72% effect on the cotton spider mite had the greatest effect compared to common poisons. Average of the highest percentage effect of liquid sulfur and tested acaricides on the cotton spider mite on sampling dates, liquid sulfur 2 and 4 parts per thousand with an average effect of 50.8-53.25 percent and acaricide propargite 1lit/ha with average effect of 47.08%. Therefore, due to the cheapness of liquid sulfur and its availability, it can be used in the integrated cotton pest management program in Golestan province. In addition, Liquid sulfur treatment with a dose of 6 per thousand per hectare showed burn marks on cotton leaves.