It is a pest of peas during the flowering and podding stages. The adult is a butterfly bright blue (males) to brown (females) in colour. They have small tails at the edge of the hind wings, and two eye-like spots near each tail. The wing undersides are sandy-brown with creamy transverse bands.
The moth lays eggs singly on the shoots, on or near the young flowers. Upon hatching the small caterpillars are yellow in colour, and are very active feeding first inside the flower and then inside the developing pod eating the young seeds. On small pods the caterpillar makes a hole in the pod wall in order to reach the seeds.
Older caterpillars are grub-like green or pear white in colour and reach up to 15 mm when fully-grown. Pupation takes place amongst debris and leaves on the ground, under stones, or even in a curled-up, withered leaf on the plant.
What to do:
Conserve natural enemies. Parasitic wasps and flies attack caterpillars and are important for the natural control of this pest.
Other pests: Anthracnose, Bacterial blight, Broomrape, Snails (Giant East African Snail)
Geographical Distribution in Africa
General Information and Agronomic Aspects
Peas are cultivated for the fresh green seeds, tender green pods, dried seeds and foliage. Dry seeds are used for food and feed. For food, they are cooked whole, split or ground into flour, and boiled or roasted. Large amounts are canned. Fresh peas are canned or frozen in the immature form.
They are a major vegetable and commercial crop. Some cultivars are grown for their tender green pods such as snap peas (sugar snaps) and snow peas (sweet peas) mainly for export. The crop is also suitable as forage, hay, silage and green manure. Kenya export of garden peas in 2005 amounted to 2,206 tons at a value of KSh 729 million, and of snow peas 1,739 tons at a value of KSh 448 million. Total area of garden peas in 2005 was 5,313 hectares and for snow peas 1,550 hectares for both local and export market.
Raw or Cooked Peas
Food Energy (Calories / %Daily Value*)
Carbohydrates (g / %DV)
Fat (g / %DV)
Protein (g / %DV)
Calcium (g / %DV)
Phosphorus (mg / %DV)
Iron (mg / %DV)
Potassium (mg / %DV)
Vitamin A (I.U)
Vitamin C (I.U)
Vitamin B 6 (I.U)
Vitamin B 12 (I.U)
Thiamine (mg / %DV)
Riboflavin (mg / %DV)
Ash (g / %DV)
Peas, edible-podded, raw (Snowpeas)
42.0 / 2%
7.5 / 3%
0.2 / 0%
2.8 / 6%
43.0 / 4%
53.0 / 5%
2.1 / 12%
200 / 6%
1087 IU / 22%
60.0 / 100%
0.2 / 8%
0.0 / 0%
0.2 / 10%
0.1 / 5%
0.6
Green Peas cooked
84.0 / 4%
15.6 / 5%
0.2 / 0%
5.4 / 11%
27.0 / 3%
117 / 12%
1.5 / 9%
271 / 8%
801 IU / 16%
14.2 / 24%
0.2 / 11%
0.0 / 0%
0.3 / 17%
0.1 / 9%
0.9
Green Peas raw
81.0 / 4%
14.5 / 5%
0.4 / 1%
5.4 / 11%
25.0 / 2%
108 / 11%
1.5 / 8%
244 / 7%
765 IU / 15%
40.0 / 67%
0.2 / 8%
0.0 / 0%
0.3 / 18%
0.1 / 8%
0.9
Peas, mature seeds, sprouted, cooked
98.0 / 5%
17.1 / 6%
0.5 / 1%
7.0 / 14%
26.0 / 3%
24.0 / 2%
1.7 / 9%
268 / 8%
107 IU / 2%
6.6 / 11%
0.1 / 6%
0.0 / 0%
0.2 / 14%
0.3 / 17%
1.0
Peas, mature seeds, sprouted, raw
124 / 6%
27.1 / 9%
0.7 / 1%
8.8 / 18%
36.0 / 4%
165 / 17%
2.3 / 13%
381 / 11%
166 IU / 3%
10.4 / 17%
0.3 / 13%
0.0 / 0%
0.2 / 15%
0.2 / 9%
1.1
Pigeon Peas (Red Gram) cooked
121 / 6%
23.2 / 8%
0.4 / 1%
6.8 / 14%
43.0 / 4%
119.0 / 12%
1.1 / 6%
384 / 11%
3.0 IU / 0%
0.0 / 0%
0.1 / 3%
0.0 / 0%
0.1 / 10%
0.0 / 0%
1.1
Pigeon Peas (Red Gram) raw
343 / 17%
62.8 / 21%
1.5 / 2%
21.7 / 43%
130 / 13%
367 / 37%
5.2 / 29%
1392 / 40%
28.0 IU / 1%
0.0 / 0%
0.3 / 14%
0.0 / 0%
0.6 / 43%
0.2 / 11%
3.5
*Percent Daily Values (DV) are based on a 2000 calorie diet. Your daily values may be higher or lower, depending on your calorie needs.
Climatic conditions, soil and water management
Peas produce best yields and quality in cool and moist growing conditions. They grow reasonably well between 10 and 30degC with an optimum of 20degC. Temperatures above 30degC will cause poor pollination, early maturity and lower yields. Good soil moisture content is a requirement of peas, particularly at flowering and pod development. A minimum of 400 to 500 mm rainfall per cropping season (about three months) is required for growing peas without supplementary irrigation In tropical regions, the crop has to be grown above an altitude of 750 m. Peas can grow on a wide range of soils but thrive best on a well-drained soil with an optimum pH of 6 to 7.7 and a high content of soil organic matter. Time of sowing and place in the crop rotation depend on regional climate, variety and purpose of growing, whether for export or for local use. Dry peas are primarily grown as a break or catch crop in cereal rotations.
Varieties
There are two types of pea varieties based on the texture of the seed coats: Wrinkled seed type – this is due to the sugar content and the varieties are used for fresh consumption or export. Smooth seed type – these are used for dry peas and the main variety is “Black Eyed Susan”.
Peas grown for fresh consumption of their seeds (green or garden peas) are harvested as soon as the pods are well-filled but the seeds are still tender and sweet. Generally, the pod is discarded after the peas are removed; but some young tender varieties have an edible pod, which are often used in Chinese dishes. Green peas are highly perishable and the sugar to starch conversion begins the moment they are picked.
Some varieties of green peas (garden peas):
“Green Feast”
Earlicrop” – a short, early maturing variety that does not require staking”
Onward” – a climbing variety suitable for wet season production”
Alderman” – a late maturing variety that requires staking.
Snow peas or sugar peas have edible flat pods and very small seeds. They are harvested when very young, just as the seeds start to form. If not picked at this stage, they can be shelled and eaten as garden peas, but are starchier and not as sweet.
Sugar snaps are also an edible pod pea but have larger and sweeter seeds and a thicker pod than snow peas, but more delicate than the green peas. They are grown to full size and then eaten like snap beans. Both snow peas and sugar snap peas last much longer than the green pea. The main varieties of snow peas grown in Kenya (Kenya (Horticultural Crops Development Authority, Kenya, HCDA).
Variety
Flower colour
Plant height (cm)
Pod size (cm)
Maturity
“Mammoth Melting Sugar”
White
180-200
8-12
“Dwarf Grey Sugar”
Purple
70
7-8
Early maturing
“Oregon Sugar Pod”
Purple
60-70
8-10
Early maturing
“Sugar Snap”
White
60-70
6.5-7
Early maturing
“Toledo”
White
60-65
For export crops, the exporters normally provide the seed, choosing from many imported seed varieties (not all of which are well adapted to East African climate).
Propagation and planting
Peas are sown directly on well prepared moist soils. The seeds should be planted at a depth of 2.5 cm if the soils are deep. In dry, light soils the seeds should be planted about 4 cm deep. Peas need warm soil to grow and good spacing for adequate sunlight. The seeds should be sown in double rows of 10 x 50 to 60 cm. If staked, this is done between the double rows using twigs or short-staked wires and/or strings.
In soils with low organic matter, up to 2 0 tons/ha of manure or compost should be applied before planting, as well as up to 200 kg/ha of rock phosphate. Being a legume, peas are not responsive to nitrogen fertiliser, however it is recommended to inoculate the seeds with rhizobium (any of a genus (Rhizobium) of nitrogen-fixing bacteria found in nodules on the roots of certain leguminous plants) to encourage the plants to fix enough nitrogen from the atmosphere. Inoculating with rhizobium has been shown to increase yields by up to 100%. Mix crop residues and organic matter in the top 20 cm of the soil prior to planting. This destroys current weed growth and provides a granular bed for seeding.
Husbandry
The first key need of peas is moisture. They have to be irrigated when conditions become dry. Also weed control is very essential at an early stage to reduce competition for nutrients. However, peas develop rapidly and the need for weeding is reduced when fully grown. Shallow cultivation is recommended to avoid root damage. A suitable crop rotation program involving grains, potatoes and brassicas should be used. For good quality fresh market peas staking is recommended.
Harvesting
Green peas are ready for harvesting 8 to 12 weeks after planting. The time to harvest is determined by the appearance of the pods. For garden peas this means pods should be well filled but still smooth and green. Pod peas are harvested when pods have reached full size but before development of seeds. As the pods mature the sugar content decreases and market appeal is lost. The harvesting period may last 4 to 6 weeks. Yields vary from 1.5 tons to over 5 tons of shelled peas per hectare, with average yields of 2.5 to 3.5 tons per hectare. For the fresh market, yields of peas in pods vary from 3 tons to 10 tons per hectare, or an average of 5 or 6 tons of pods per hectare. Edible pod peas will normally yield 3 to 5 tons of pods per hectare. For fresh market whether local or export, the harvested pods are sorted and packed. Washing is not desirable as it may bruise the pods; so soiled pods are discarded during sorting along with malformed or diseased pods. Rejected peas are excellent animal feed. For dry peas the whole plant can be uprooted when about 80% of pods have turned brown and dry. The haulm is then either left in the field or carried to a threshing place to dry completely, after which the peas are threshed and winnowed.
All parts of the pepper plant can be affected. Seedlings can be killed. Collar rot and wilt phase is most common and is characterised by a dark brown stem discolouration extending upward from the soil line accompanied by a sudden wilt of the entire plant.
Upper stem lesions (spots) are also dark brown and occur primarily at branch points causing death of branches above the lesions.
Leaf spots are round or irregularly shaped, dark green and water-soaked. They later dry and become light tan.
Fruit infection begins as water-soaked, dull green spots that expand rapidly to cover the entire fruit.
Later the fruits become flaccid and wrinkled but do not detach from the affected plants.
The host range of the fungus includes cucurbits, eggplants and tomatoes. The fungus can survive on and in seeds, in soil and in crop debris.
The collar rot and wilt phase is most severe in over-irrigated or poorly drained fields.
Aboveground infection is associated with extended periods of rainfall or overhead irrigation.
What to do:
Plant resistant cultivars, if available.
Use certified disease-free seeds.
Grow on elevated beds.
Practise good water management.
Practise crop rotation (avoid in the rotation crops such as cucurbits, eggplant and tomatoes).
About 17 viruses have been reported to attack peppers.
Those considered economically important in Africa include alfalfa mosaic, chilli veinal mottle, cucumber mosaic, pepper veinal mottle, potato Y, tobacco etch, tobacco mosaic, tomato spotted wilt and chilli leaf curl.
Most of these viruses are transmitted by insects, infected seed and a few by mechanical means.
The first six above listed viruses are spread by aphids; tobacco mosaic is mechanically transmitted and infected seed; tomato spotted wilt by thrips; and chilli leaf curl by whiteflies.
Viral diseases are particularly difficult to firmly diagnose by symptoms because there is so much overlap in symptomatology.
Furthermore, symptom expression can be altered by many factors among which are cultivar, age of host plant, environmental conditions, host plant nutrition, and viral strains, not to mention the occurrence of virus mixtures.
General symptoms include mosaic patterns on leaves, yellowing , ring spots, leaf deformation or distortion, curling of leaves, and/or stunting of plants. They may also cause reduction of fruit size, distortion, and/or ring patterns.
What to do:
Plant resistant cultivars, if available.
Select planting dates to avoid high population of vectors.
Close plant spacing to compensate for diseased plants.
Use barrier crops to minimise virus spread.
Use oil sprays to reduce virus transmission by aphids.
Use reflective mulches to repel aphids and thrips.
Use certified disease-free seed in case of tobacco mosaic virus.
Anthracnose caused by Colletotrichum spp. is a major problem of ripened fruits. The fungus produces dark, sunken spots up to 2.5 cm across on sweet pepper.
The spots occur on green and ripe fruits and their surface may be covered in moist weather with salmon-pink mass of spores. The fungus is seed-borne.
What to do:
Use certified disease-free seeds.
Hot water treat own produced seeds.
Practise field sanitation (removal of crop debris after harvest).