Cucurbita maxima · Shrub
Powdery mildew: Improve air circulation, avoid wetting foliage when watering, and apply a copper-based fungicide or biological control if severe.
Slugs and snails: Use physical barriers like copper tape or crushed eggshells, and set out beer traps or iron phosphate baits at night.
Grey mould (Botrytis): Ensure good ventilation, remove affected plant parts immediately, and avoid overcrowding to reduce humidity.
Poor fruit set: Hand-pollinate female flowers using a male flower or cotton bud, especially during cool, wet weather or low pollinator activity.
Vine weevil: Apply nematode-based biological controls to the soil in autumn and spring, or use insecticidal drenches.