Investigation on Incidence of Brown Spot of Lagerstroemia speciosa and Screening of Fungicides in Sanmenxia
Lagerstroemia indica brown spot is a common disease in Sanmenxia,China,directly affecting the growth of Lagerstroemia indica,as well as garden greening and landscape aesthetics.The occurrence of brown spot of Lagerstroemia indica is closely related to the environmental conditions,with optimal temperatures for occurrence between 21℃ and 32℃,peaking from late May to mid-September.Factors such as low-lying areas prone to wa-ter accumulation,dense plant growth,and excessive nitrogen fertilizer contribute to disease susceptibility.The field trial showed that the immediate control effect of 10%alkenoxime·10%tebuconazole 2 000-fold solution was 73.04%,the relative control effect of 60%pyrazolylether·metiram was 70.75%,the control effect of 25%tebuconazole 2 500-fold solution was 67.03%,the control effect of 10%alkenoxime·10%tebuconazole·1 000-fold solution was 70.75%,the control effect of 25%tebuconazole·1 000-fold solution was 67%.In terms of long-term effect,the control effect of treatment 3 was 82.65%～86.21%.Lagerstroemia indica brown spot can be effectively controlled by garden management,ecological control,and chemical control.
Lagerstroemia indicaBrown spotOccurrence of harmChemical controlEfficacy
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万方数据
