Powdery mildew of Cucurbits
Sphaerotheca fuliginea (Podosphaera xanthii, Erysiphe cichoracearum)
All cucurbits are susceptible to powdery mildew, but the disease is less common on watermelon than on other cucurbits. Powdery mildew first appears as pale yellow spots on stems, petioles, and leaves. These spots enlarge as the white, fluffy mycelium grows over plant surfaces and produces spores, which give the lesions a powdery appearance. Affected leaves become dull, chlorotic, and may show some degree of wilting in the afternoon heat; eventually they become brown and papery.
Pesticides
Affix 250 SC
intensity: ★★★
Az 250
intensity: ★★★
Azaka
intensity: ★★★
Citadel
intensity: ★★★
Colliss
intensity: ★★★
Crop Culture Azoxy 250
intensity: ★★★
Fontelis
intensity: ★★★
Mirador 250 SC
intensity: ★★★
Nimrod
intensity: ★★★
Rotam Escudo 250 SC
intensity: ★★★
Talendo
intensity: ★★★
UniShield 800 DF
intensity: ★★★
Vivando
intensity: ★★★
Amistar WG
intensity: N/A
Azoxyguard 250 SC
intensity: N/A
Slingshot
intensity: N/A
Spartacus 250 SC
intensity: N/A
Spartacus 500 WG
intensity: N/A
Supernova 250SC
intensity: N/A
Triad
intensity: N/A
Triadimefon 125
intensity: N/A