Fusarium wilt of Watermelon – Vegetable Crops Hotline

Fusarium wilt of Watermelon

Fusarium wilt of watermelon on black plastic.

Figure 1: Fusarium wilt of watermelon often causes one vine to wilt while the rest of the plant appears unaffected. Symptoms of this disease often begin when plants are just starting to vine.

Crown area of watermelon with Fusarium wilt.

Figure 2: Vascular discoloration present in lower stem may be a symptom of Fusarium wilt of watermelon. Note that one-sided vascular discoloration in the stem may correspond to one-sided wilt in plant.

Distrubtion of Fusarium wilt of watermelon

Figure 3: The distribution of Fusarium wilt of watermelon in the field is often clustered.

Early symptoms of Fusarium wilt of watermelon.

Figure 4: Early symptoms of Fusarium wilt in watermelon include wilt of almost all leaves. Note coloration of wilted leaves.

One-sided wilt of watermelon leaf.

Figure 5: One sided wilt of watermelon leaf. Note also that older leaves usually wilt before young leaves.

Seedling distribution of Fusarium wilt of watermelon.

Figure 6: Seedling distribution of Fusarium wilt in watermelon may be randomly distributed in transplant trays.

Clustered distrubtion of Fusarium wilt of watermelon in transplant trays.

Figure 7: Distribution of Fusarium wilt of watermelon in transplant trays may be clustered under some circumstances.

symptoms of Fusarium wilt on watermelon seedling.

Figure 8:Hypocotyl has collapsed and become necrotic due to Fusarium wilt in watermelon at the transplant stage. Note pink-like sporulation of Fusarium fungus at top of hypocotyl.

Fusarium wilt of watermelon seedling.

Figure 9: close-up of hypocotyl of watermelon seedling infected with Fusarium wilt.

Late season Fusarium wilt in watermelon.

Figure 10: When Fusarium wilt in watermelon occurs in late season, wilt and collapse of vines such as seen here in the foreground may occur.

Vascular discoloration in Fusarium wilt of watermelon late season.

Figure 11: Vascular discoloration in Fusarium wilt of watermelon in a late season production.

Late season Fusarium wilt in watermelon vines.

Figure 12: Fusarium wilt of watermelon in this late season field has caused some of the vines to become necrotic while some vines remain apparently healthy.

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