Regular applications of a foliar fungicide for control. Yellowish-brown spotting of the leaves. Spots are bounded by larger veins. Spots coalesce until entire leaf is affected. Leaves die and fall.
Symptoms start at base and progress up plant.
Avoid wet humid conditions, do not water from top. Use a peat mulch. Use disease-free propagating material. Phosphate insecticides will control nematode on plant.