Australia

Gummy stem blight

Didymella bryoniae (Mycosphaerella melonis)

Gummy Stem Blight affects many cucurbits including watermelon, cantaloupe, cucumber, pumpkin, and some squash. Some symptoms are common of all Gummy Stem Blight infections while other symptoms can vary depending on the specific host the pathogen has infected. Hosts can become infected at any time in their life. When the pathogen is present in a young seedling, the cotyledons will sprout appearing dark and drenched. When older plants become infected, their leaves may appear water soaked and begin to develop dark tan lesions. The leaves begin to turn brown at the margins and necrosis progresses towards the base of the leaf.
Cankers, which may or may not have black spots, may appear in the epidermal cortical tissue and on the stems of infected plants. Black spots, if visible, are pycnidia and/or perithecia. Black rot is a common symptom on the fruit of Gummy Stem Blight infected cucurbits. Lesions formed on the fruit; start as water soaked spots that expand and exude gummy ooze. As the spots grow they develop fruiting bodies which turn the spots black. Fruit can also rot internally, with the only symptoms being shriveling and discoloration of centrally located tissue. Fruit rot can occur while in the field or after fruit has been harvested.

Pesticides
Acrobat
intensity: ★★★
Acrobat MZ 690
intensity: ★★★
Acrobat SC
intensity: ★★★
Acrobat WDG
intensity: ★★★
Affix 250 SC
intensity: ★★★
Antracol
intensity: ★★★
Aprisco 900 WG
intensity: ★★★
Axiom MZ 720
intensity: ★★★
Azaka
intensity: ★★★
Bravo
intensity: ★★★
Bravo Weather Stik
intensity: ★★★
Cavalry Weatherguard
intensity: ★★★
Cherokee 900
intensity: ★★★
Conan 500
intensity: ★★★
Conan 720 SC
intensity: ★★★
Crop Culture Azoxy 250
intensity: ★★★
Dithane Rainshield Neo Tec
intensity: ★★★
FMC Chlorothalonil 720
intensity: ★★★
FMC Chlorothalonil Bond 720
intensity: ★★★
Fontelis
intensity: ★★★
Frenta 750 WG
intensity: ★★★
Galben M
intensity: ★★★
Manzate DF
intensity: ★★★
Mirador 250 SC
intensity: ★★★
Ospray Copper Oxychloride-WP
intensity: ★★★
Penncozeb
intensity: ★★★
Penncozeb 750 DF
intensity: ★★★
Polyram DF
intensity: ★★★
Ridomil Gold MZ WG
intensity: ★★★
Rotam Aprisco
intensity: ★★★
Rotam Escudo 250 SC
intensity: ★★★
Rotam Milor 720 WP
intensity: ★★★
Rotam Winner Mancozeb WP
intensity: ★★★
Sphinx
intensity: ★★★
Unizeb Disperss 750 DF
intensity: ★★★
Zeemil 720 WG Systemic and Protective
intensity: ★★★
Zeemil MZB 720 WP Systemic and Protective
intensity: ★★★
Amistar WG
intensity: N/A
Arysta LifeScience Copper Oxychloride WP Fungicide/Bactericide
intensity: N/A
Arysta LifeScience Mancozeb 750 WG
intensity: N/A
Barrack 720
intensity: N/A
Barrack Betterstick
intensity: N/A
Chlornil 720 SC
intensity: N/A
Chloronil Pro
intensity: N/A
Chlorothalonil
intensity: N/A
Clash Dry 900 WG
intensity: N/A
Clash Storm Guard 720 SC
intensity: N/A
Echo 720
intensity: N/A
Manco 750 WG
intensity: N/A
Mancoflo
intensity: N/A
Manzeb
intensity: N/A
Maxyl
intensity: N/A
Medley Mz
intensity: N/A
Metal-Man Mz 720
intensity: N/A
Pacific Echo 500 SC
intensity: N/A
Spartacus 500 WG
intensity: N/A
Supernova 250SC
intensity: N/A