How to Manage Pests
UC Pest Management Guidelines
Beans require proper nutrition for normal growth and yields, and deficiencies and/or excesses of nutrients can cause disease-like conditions.
Symptoms vary depending on the nutrient involved, the cultivar, and the environmental conditions. In general symptoms include the overall yellowing, bronzing, or purpling of plants and/or light green or yellow areas in between dark green veins. Plants tend to be stunted and show poor growth.
The most common nutrient deficiencies occur with magnesium and phosphorous; others include: boron, calcium, copper, iron, manganese, nitrogen, phosphorous, sulfur, and zinc. Toxicities include aluminum, boron, and manganese. Soil pH plays an important role in availability of nutrients. Low soil pH is associated with: aluminum toxicity, calcium deficiency, magnesium toxicity or deficiency, manganese deficiency, and/or nitrogen and phosphorous deficiency. High soil pH is associated with: boron, iron, manganese, and zinc deficiencies. Soil or plant tests may be needed to precisely determine nutrient problems.
Know the pH and nutritional properties of the fields in which beans are to be planted and follow recommended practices for cultivation of beans. Adjust pH and/or nutrient levels when necessary.
UC IPM Pest Management Guidelines: Dry