Cabbage Physiological

DisordersToT to FFS Staff By Mr. Allah Dad

KhanProvincial

Coordinator IPM KPK MINFAL

INTERNAL TIPBURN

Internal tipburn of cabbage can be an economic problem in the United States and northern Europe. Although this disorder probably has occurred to a limited extent for a long time, the incidence has become higher in recent years because of the more-intensive production practices currently used to obtain higher yields. White, red, and savoy cabbage are all affected.

Symptoms

BLACK PETIOLE

Black petiole or black midrib is an internal disorder of cabbage that has been occasionally noted in recent years. It was first described in New York in 1967. As heads approach maturity, the dorsal side of the internal leaf petioles or midribs turns dark gray or black at or near the point where the midrib attaches to the core. The.affected area may be quite limited or may extend for 2 or 3 inches along the midrib

Symptoms

PEPPER SPOT

Pepper spot or black speck is yet. another nonparasitic disorder of cabbage. This disease, which was first described in 1919, is apparently quite widespread in the United States and in Europe. It occurs with varying severity on the outer leaves of the head, but often can be seen deep in the center of the head

Symptoms

OEDEMA OF CABBAGE Oedema is a physiological response of the

plant to excessive soil moisture during periods of cool nights and warm, humid days. Many small scabby lesions form on the underside of the cabbage leaves. Avoid irrigation during times when day-night temperature variations are great. Oedema may be confused with thrips damage

J-ROOTING

This is caused by poor transplanting practices, when seedlings are pushed into the soil in such a way that the roots are not vertical, but bent to one side. This has a greater effect on growth than you would think. A month or so later the plants will be stunted and usually unmarketable.

MAGNESIUM DEFICIENCY

Older leaves lose their green color except in the veins

Symptoms

BLINDNESS (CABBAGE )

Causes: Damage to terminal growing point due to low temperature, cutworm damage or rough handling of transplantsSymptoms: Plants have lost their terminal growing points. The leaves that develop are large, dark, green, thick and leathery. The plant does not produce a marketable head or curd.Remedy: Handle transplants carefully, control cutworms and avoid low temperatures.

Symptoms

LEAF TIPBURN (CABBAGE)

Tipburn, cauliflower Carl Rosen, University of Minnesota

Cause: localized calcium deficiency due to water stress or uneven watering even with adequate levels of soil calcium presentSymptoms: Younger leaves show signs of browning at the tips (see photo). In cabbage, the browning can be seen only after the head is cut open.

Symptoms

NitrogenDeficiency SymptomsYellowing of old leaves; stunted plant growth

Correction MeasureFoliar spray of urea@1%

PhosphorusDeficiency SymptomsPigmentation in old leaves; curd size and quality will be affected

Correction MeasureSoil application of recommended dose phosphorus and foliar spray of

PotassiumDeficiency SymptomsAppears first on oldest cabbage leaves as spots shiny green leaves turn dull green, leaf margins turn a yellowish green followed by withering mature heads are loose and smaller. In K-deficient cauliflower, leaf tips turn brown, leaves turn inward and can have a crinkled surface.

Correction MeasureFoliar spray of K2SO4 1% twice at weekly intervals.

CalciumDeficiency SymptomsLeaf growth will be inhibited; scorching symptoms occur in new leaves

Correction MeasureFoliar spray of CaCl2@1%

MagnesiumDeficiency SymptomsStunted plant growth; leaves become small; yellowing symptoms occur in old leaves

Correction MeasureFoliar spray of MgSO4@0.5-1.0%

SulphurDeficiency SymptomsYoungest leaves turned purplish, cupped upward leaf edges rolled in.

Correction MeasureSoil application of Gypsum 50 kg/ha.

BoronDeficiency SymptomsApical growing points stop developing leaves thick brittle and irregular chlorosis.

Correction MeasureFoliar spray of Borax 0.5 % at fortnightly intervals

CopperDeficiency Symptoms. Symptoms occur in young leaves; leaf growth will be affected; curd size also affected

Correction MeasureFolia spray of CuSO4@0.5%

IronDeficiency SymptomsChlorosis occur in young leaves; leaves become smaller in size; stunted plant growth

Correction MeasureFoliar spray of FeSO4@0.5%

ManganeseDeficiency SymptomsSymptoms seen in young leaves; occurence of chlorosis; leaves become pale yellow in color

Correction MeasureFoliar spray of MnSO4@0.4%

MolybdenumDeficiency SymptomsStunted plant growth with malformed leaves

Correction MeasureFoliar spray of sodium molybdate @ 10mg/litre

ZincDeficiency SymptomsOccurence of little leaf symptoms; curd size will be small; chlorosis occur in young leaves

Correction MeasureFoliar spray of ZnSO4@0.5%