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Black vine weevil
(Ostiorhynchus sulcatus)
Symptoms:
- Leaf edges damaged by adult weevils
- Roots attacked by larvae
- Plant partially or totally wilted
Control methods:
- Do not overwater.
- Inspect plants starting in mid-June, after sunset (when the adults are active).
- Pick off and destroy any weevils.
- Place sticky strips around the base of the main stems.
- Use nematodes to control larvae in the soil.
Root and crown rot
(Phytophtora sp.)
Symptoms:
The fungus lives in the soil, proliferates in stagnant water and gets into a plant through a damaged crown or roots.
- Plant partially or totally wilted
- Stems, petioles and leaves turn brown
Control methods:
- Mulch the soil and avoid damaging the roots.
- Do not overwater.
- Remove plant debris.
- Destroy any severely affected plants.
Powdery mildew
(Mycosphaerella sp.)
Symptoms:
- Powdery white down on upper and sometimes lower leaf surfaces
Control methods:
- See the fact sheet.