Cabbage are vegetables of Brassica family (also called cruciferae family)
• pH levels between 6.0-6.5
• Soils rich in organic matter, sandy loam or loam and well drained
• Soil analysis recommended for accurate fertilization
Cabbage is a cool season crop which requires an optimum growth temperatures range of 15- 20° C. Head formation reduced at temperatures higher than 25 degrees Celsius. It requires adequate well distributed rainfall. Moisture levels are especially critical during the early stage of the crop growth. If the levels are low, irrigation should be used to supplement and relive the moisture stress.
Choosing a variety
While making a choice on the variety to produce, a farmer need to consider several key factors among them the maturity duration, yield potential, tolerance and resistance to pests and diseases, good field holding capacity, uniform maturity to ensure a single harvest and preference in the market among other qualities.
Plant spacing is important and depends with the variety and the choice of the farmer pegged on the market demands.
- Varies with varieties: 60cm x 60cm for large-headed varieties, 60cm x 45cm for medium sized and 30cm x 30cm for small heads
• Raised beds recommended for root development and proper drainage
• Bed width of 1 meter and a convenient length not exceeding 100 meters and a height of 15 centimeters
With Greenlife we recommend TLO combination
Trinity Gold® 452WP 100g/20L to control soil borne diseases such Damping off
Loyalty® 700 WDG 10g/20L to control soil borne pests
Optimizer® 20ml/20L to break seed dormancy and ensure uniform growth
- Seedlings ready for transplanting after 4-6 weeks in the nursery, depending on temperatures
- Wet the seedlings an hour before transplanting.
- Plant to the same depth as in the nursery 15cm
- Use Optimizer 10ml/20L to relieve transplanting shock
Pest and disease management
Cabbage is a host to several pests that include diamond back month (DBM), aphids and cabbage saw fly. Diseases that attack cabbage include black rot, fungal spots and bacterial soft rot.
Diamondback moth (Plutella xylostella)
The larvae emerge from their mines at the conclusion of the first instar, molt beneath the leaf, and thereafter feed on the lower surface of the leaf.
Cabbage leaf sawfly (Athalia rosae)
Sawflies are sporadic but serious pests of brassicas. They are black/green caterpillars with a black head.
Cabbage aphid (Brevicoryne brassicae)
Aphids feed by sucking sap from their host plants. Continued feeding by aphids causes yellowing, wilting and stunting of plants.
Cutworms are recognized by their smooth skin, greasy gray color and “C-shaped”; posture when disturbed. Eggs are laid by the night flying moths on grasses, weeds, and other host plants. Cutworms feed at night causing serious damage to stems and foliage of young plants, during the day they retreat to their underground burrows.
Use Pentagon® 50 EC 10ml/20L
Black rots (Xanthomonas campenstris)
The disease is easily recognized by the presence of large yellow to yellow-orange “V”-shaped areas extending inward from the margin of a leaf, and by black veins in the infected area.
Caused by Hyaloperonospora parasitica previously known as Peronospora parasitica
Downy mildew is first seen as a fluffy or powdery-white mass of spores on the undersurface of brassica leaves. This is followed by a black speckling and puckering of the upper surface. Leaves prematurely turns yellow and fall from the plants.
Seeds may be infected as soon as moisture penetrates the seed coat or a bit later as the radicle begins to extend, all of which rot immediately under the soil surface (pre-emergence damping-off). Infection results in lesions at or below the soil line. The seedling will discolor or wilt suddenly, or simply collapse and die.
Caused by Sclerotinia sclerotiorum
Symptoms often first appear as water soaked spots on lower or upper cabbage leaves. As water soaked spots enlarge, infected tissue becomes soft, and some outer leaves begin to wilt. A white cottony growth becomes evident on the leaves as the disease progresses.
Alternaria Leaf spot
Alternaria Leaf Spot is a common disease of cabbage caused by the fungal pathogen Alternaria brassicicola
The most common symptom of Alternaria diseases is yellow, dark brown to black circular leaf spots with target like, concentric rings. Lesion centers may fall out, giving the leaf spots a shot-hole appearance. Individual spots coalesce into large necrotic areas and leaf drop can occur.
The amount of fertilizers to be applied will depend on the soil analysis report and soil type. During early stages a lot of Phosphorus is needed to help in root establishment which will be supplied by foliar feeding Goldchance Super Start 14:28:18 50g/20L or Lavender 24:24:18 20ML/20L
During vegetative stage a lot of Nitrogen is needed and this is achieved through foliar feeding Lavender 20ml/20l or Goldchance Super Growth 50g/20L
During head formation potassium is needed to ensure proper head formation and this achieved by Lavender 20ml/20L
Optimal production of these Brassica leafy vegetables depends on successful weed control. Weeds reduce yields by direct competition for nutrients, water, and light.
Weed control is especially important early in the season when weed competition can substantially reduce vigor, uniformity, and overall yield.
Greenlife solution: use Commander® 240EC 50ml/20ml a pre-emergence herbicide 2-3 days before transplanting to control weeds
Cabbage can be harvested any time after the heads form. For highest yield, cut the cabbage heads when they are solid (firm to hand pressure) but before they crack or split. When heads are mature, a sudden heavy rain may cause heads to crack or split wide open. The exposed internal tissue soon becomes unusable.