Caterpillars, Pod Borers

The larva has a whitish to pale-green or pale-brown body with irregular brownish-black spots.



Small black green to grey pest that feeds on plant leaves/fruits resulting to black/sticky color on leaves and fruits



Small caterpillars that feeds by drawing some line on the top of the leaves causing the leave to drop.


White Flies

Damage on bean and pea occurs from adult feeding. Severe infestation may be retarded.


Leaf Miners

Small caterpillars that feeds by drawing some line on the top of the leaves causing the leave to drop.


Red Spider Mites

Causes whitening or yellowing of leaves, which then dry out and eventually fall off. Leaves may appear purplish , Leaves turn yellow


Powdery Mildew

White superficial powdery fungal growth on leaves, Yellow to brown discoloration of upper leaf, Edges of leaf may curl upward


Where affected tissue softens, becomes water-soaked, and turns brown.

Leaf Spots

Small circular dark spots on lower leaves and/or stems, Leaf yellowing, Leaf edges


Small white flakes on leaves and stems, Develop into circular or elongated orange pustules, Yellowing of leaves


Angular dark brown spots on leaves with yellow border, elongated patches with sunken centers on stems and fruit


Pig weed

Highly aggressive, fast growing annual with a red upright stem and soft green triangular leaves. Germinates all year-round and produces very high numbers small black seeds very quickly. Very quick to develop resistance to several common herbicides which makes it often very difficult to control.

Sow thistle

Tall, succulent plant with soft stems and spiked, waxy leaves that often release milk when broken. Produces a large number of seeds and commonly encountered across soil types and farming systems.

Thorn apple

Large, upright plant that grows over a meter tall and produces poisonous seeds in a thorn-covered fruit at the centre of the main stem. Very common in most areas and soil types. Grows up to 1.5m high in fallows.

Black Nightshade

Short, spreading broadleaf plant closely related to the potato. Produces seeds in toxic black or orange berries. Once established can be difficult to control with herbicides. Prefers cooler climates.Is a host of several potato diseases and pests so control is important in potato rotations


Heart-shaped, trifoliate leaf structure similar to clover but with triangular leaf base rather than rounded. Very short, prostrate growth. Two distinct species predominate in Kenya.

Mexican marigold

Small yellow flowers on a tall stem, and strong smell that can contaminate the grain sample at harvest. Leaves vary from long oval to fern-like. One of the few weeds that is resistant to atrazine. Competitiveness Moderate

Black jack

Very common fast growing arable weed. Found in open ground and easy to control with herbicides, but often germinates late in the season in maize crops. Does not like crop competition and shade.


These are perennial plants that are commonly found in shallow water or moist soils and can reach 4 feet in height. They resemble grasses and often grow in thick clusters.