Brussels Sprout Physiological DisordersToT to FFS Staff By Mr. Allah Dad KhanProvincial Coordinator IPM KPK MINFAL

Symptoms Boron deficiency in lo bok

Cole crops have a moderate to high boron requirement. Symptoms of boron deficiency vary with crop type. Most boron deficient cole crops develop cracked and corky stems, petioles and midribs. The stems of broccoli, cabbage and cauliflower can be hollow and are sometimes discolored. Cauliflower curds become brown and leaves may roll and curl, while cabbage heads may be small and yellow. Of all the cole crops, cauliflower is the most sensitive to boron deficiencies.

Boron Deficiency

Recommendation for boron Control

It is recommended in broccoli and kale to apply 1.5-3 pounds of boron (B) per acre in mixed fertilizer prior to planting. In Brussels sprouts, cabbage, collards and cauliflower, boron and molybdenum are recommended. Apply 1.5-3 pounds of boron (B) per acre and 0.2 pound molybdenum (Mo) applied as 0.5 pound sodium molybdate per acre with broadcast fertilizer.

Boron may also be applied as a foliar treatment to cole crops if soil applications were not made. The recommended rate is 0.2-0.3 lb/acre of actual boron (1.0 to 1.5 lbs of Solubor 20.5%) in sufficient water (30 or more gallons) for coverage. Apply foliar boron prior to heading of cole crops.

(broccoli, Brussels sprouts, cabbage, cauliflower, cole crops, micronutrient deficiency, physiological disorders)

Symptoms

Growth dwarfed; leaves lustreless dark green, laminae and petioles dull purple tints; older leaves marginal scorch and wither early.

Phosphorus deficiency

Symptoms .

Older leaves deep purple tints changing to red

Phosphorus deficiency

Symptoms

Plant has remained stunted; leaves bluish green with dull purple tints

Brussels Sprout Phosphorus deficiency

Symptoms

Growth dwarfed, erect and stem thin; leaves pale green and older leaves bright orange, red and purple tints.

Cauliflower Plant Nitrogen dificiency

Symptoms

Hooking of young leaves and severe collapse of tissues

Cauliflower Plant Calcium deficiency

Symptoms

Calcium deficiency shows as collapse of mesophyll tissues and manganese toxicity as incurling of leaf margins followed by marginal spotting and scorching.

Cauliflower Plant Calcium deficiency and manganese toxicity (soil scidity complex

Symptoms

Older leaves chlorotic marbling followed by strong orange, red and purple tinting.

Cauliflower Plant Magnesium deficiency

Symptoms

Plants in seed bed. Older leaves strong yellow, red and purple tints as "marbled" pattern

Young Cauliflower Plants Magnesium deficiency

Symptoms

General field view at cutting time. Older leaves strong chlorotic marbling and tinting.

Cauliflower Plants Magnesium deficiency

Symptoms

Magnesium deficiency shows as chlorotic marbling of older leaves and manganese toxicity as incurling and necrosis of margins of younger leaves.

Cauliflower Plant Magnesium deficiency and Manganese toxicity (soil acidity complex

Symptoms

Leaves bluish green and slight intervenal chlorosis near margins; backward curling of laminae, and scorching and forward curling of margins

Cauliflower Plant Potassium deficiency

Symptoms

General field view at cutting time; curling and severe marginal and intervenal scorching of leaves.

Cauliflower Plants Potassium deficiency

Symptoms

Laminae of leaves restricted and may fail to develop, leaving only bare midribs. Growing point dies.

Cauliflower Plant Molybdenum deficiency

Symptoms

Cauliflower Plant Manganese toxicity (soil acidity complex)

Restricted lateral growth of leaf laminae and incurling and brown spotting of margins molybdenum deficiency).

Cauliflower Plant Manganese toxicity (soil acidity complex)

Symptoms

Corky condition of epidermis.

Cauliflower Stem and Petioles Boron Deficiency

Symptoms

Magnesium deficiency symptoms on radish

Magnesium deficiency

Numerous vegetables including brassicas, cucurbits, peas, spinach, tomato, etc. Vegetables with waxy leaves, e.g., brassicas, tend to be most susceptible.

 

Host Crops: