Symptoms squashs

• Organs attacked :

• Symptoms :
  • All aerial organs can be affected.
  • Spots with moist, circular to angular lesions, gradually browning before becoming necrotic (Figures 1 and 2). Their center is duller eventually. Some of them seem to have started from ribs.
  • Presence of a rather marked yellow halo around the lesions (figure 2).
  • Longitudinal cankerous lesions on stems and petioles, slightly sunken, beigeish in color (Figure 3), sometimes with the presence of brown exudates.
  • Zucchini fruits do not seem very susceptible to this fungus.

• Signs : presence of numerous black pits, stroma, and salmon pink gelatinous masses, acervuli producing numerous spores and materializing the asexual reproduction of Gloeosporium orbiculare . Note that these fructifications are sometimes arranged in concentric circles, that a white mycelial felting is sometimes visible on the lesions, and that they can be observed on all the affected organs.
• Possible confusion :
• >>> More pictures

• Affected production areas :

•  Colletotrichum spp. reported on squash : Gloeosporium orbiculare