Effects of different concentrations of sulfur preparations on the growth of melon

XUAN Jinlong; WANG Jing; LI Yanlong; ZHANG Jie; LIU Lu; WANG Huilin

doi:10.16861/j.cnki.zggc.2024.0770

Abstract：Powdery mildew is one of the main diseases during the growth of melon,and some of the fungicides currently used in the field to control powdery mildew contain sulfur,which is easy to cause drug damage when used improperly.Mel-on resources M446 and DM 18 were used as the experimental materials,different concentrations of sulfur preparations were sprayed to determine the relevant growth indicators.Analysis of variance,correlation analysis,principal component analy-sis and membership function analysis were used to conduct a comprehensive evaluation of different concentrations of sul-fur preparations.The results showed that the degree of sulfur damage of different sulfur formulations in melon materials M446 and DM18 were basically the same.Compared to other treatments,80％mancozeb and 0.5％potassium sulfate had a smaller inhibitory effect on the growth indicators of melon.Meanwhile,the single fruit mass of the two materials reached the maximum value at D3 treatment(600 times diluted 80％mancozeb),which were 1.36 kg and 1.93 kg,respec-tively.However,the rate of diseased leaves and the sulfur damage index showed an upward trend with the increase of sul-fur preparation concentration.Under the treatments of D3 and E3(150 times diluted 0.5％potassium sulfate),the diseased leaf rate and sulfur damage index were 56.08％,23.43％and 11.37％,3.82％,respectively,which were significantly lower than those treated with 80％sulfur suspension agent and 29％lime sulfur solution.The results of principal component analysis indicated that 80％mancozeb and 0.5％potassium sulfate ranked relatively high in the sulfur preparation treat-ment.In conclusion,applying 80％mancozeb and 0.5％potassium sulfate in the prevention and control of powdery mil-dew on melon is a relatively safe measure.The research results provide a theoretical basis for the scientific application of sulfur preparations in the cultivation and management of melon.