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


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


Onion Thrips

Mature onion thrips are about 0.05 inch (1.3 mm) while western flower thrips are slightly larger at 0.06 inch (1.5 mm). The most distinctive characteristic of thrips is two pairs of wings that are fringed with long hairs. Adults are pale yellow to light brown.


Damping Off

A soil-borne fungal disease that affects seeds and new seedlings, rotting of stem and root tissues at and below the soil surface/

Downy Mildew

Pale spots, Gray- purple fuzzy growth on leaf surface

White Tip

Yellowing of leaf tips with white areas in upper portions of the leaf blade, stunting of affected plants, twisting or distortion of the flag leaf and distortion and discoloration of panicles and florets.

Purple Blotch

Small brown elliptical spots on leaves, similar to IYSV lesions, which enlarge over time and may result in brown, necrotic streaks.


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

Neck Rot

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

Powdery Mildew

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


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.


Fast growing, prostrate annual weed with reddish stems and very succulent leaves. Prefers warmed climates and lower altitudes. Most likely to be found around Naivasha and surrounding areas.

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.

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.

Star grass

Hard to control with Group A herbicides post emergence in cereals. C4 plant, normally annual but in absence of frost survives two years. Seeds borne on short stalks arranged in a star, but seeds are much smaller and hairier than Rhodes grass.

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


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.