This article describes how to determine vineyard nutrient needs through tissue and soil sampling.
Humans help spread the disease when they transport infected plants, plant parts or infested soil.
Excessive summer irrigation of oak and madrone trees may promote fungal diseases such as the oak root fungus (aka armillaria root disease) and crown rot.
Browning or dieback is usually caused by weather-related stress, sometimes in combination with pests and diseases.
This is a guide that can be used by wine grape growers to interpret their vine tissue nutrient analysis results to determine nutrient sufficiency, deficiency or excess.