Study on the occurrence symptoms and control techniques of watermelon leaf spot disease

doi:10.16178/j.issn.0528-9017.20240405

Abstract

Abstract:

This study investigated the field occurrence symptoms of watermelon leaf spot disease, isolated and identified its pathogenic fungus, and further evaluated the field control efficacy of 10% difenoconazole water dispersible granules, 500 g·L^-1 iprodione suspension, 250 g·L^-1 azoxystrobin suspension, 250 g·L^-1 pyraclostrobin emulsifiable concentrate and 25% prochloraz·carbendazim wettable powder through field efficacy trials. The results showed that the pathogenic fungus of watermelon leaf spot disease was Cercospora citrullina. And the field efficacy trials result showed that 500 g·L^-1 iprodione suspension, 10% difenoconazole water dispersible granules, and 25% prochloraz·carbendazim wettable powder could effectively controll watermelon leaf spot disease, with control efficacy of 85.4%, 82.0%, and 76.4%, respectively. These fungicides were also safe to watermelon, providing valuable reference for the field control of watermelon leaf spot disease.

Key words: watermelon, leaf spot disease, occurrence symptoms, chemical control

CLC Number:

S651

JIANG Yuliang, WU Jun, WANG Hanrong. Study on the occurrence symptoms and control techniques of watermelon leaf spot disease[J]. Journal of Zhejiang Agricultural Sciences, 2025, 66(11): 2708-2711.

Figures/Tables 5

Fig.1 Occurrence symptoms of watermelon leaf spot

Fig.2 Morphological characteristics of pathogenic bacteria

Fig.3 ITS sequence of the pathogen

Fig.4 Phylogenetic analysis of ITS sequence of the pathogen

Table 1 Field control efficacy of different fungicides on watermelon Cercospora leaf spot

处理	施药前病情指数	第1次施药后10 d		第2次施药后10 d
处理	施药前病情指数	病情指数	相对防治效果/%	病情指数	相对防治效果/%
T1	0.3	0.5	64.5	1.2	82.0
T2	0.4	0.8	57.8	1.3	85.4
T3	0.3	0.6	57.9	1.7	74.5
T4	0.2	0.4	57.9	1.6	64.4
T5	0.4	0.5	73.6	2.1	76.4
T6	0.4	1.9	0	8.9	0

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