Insects

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African bollworm

African bollworm moths have a 40 mm wingspan making them strong fliers. Forewings are reddish-brown and have irregular green lines. Caterpillars/larvae have an elongated creamy-white to reddish-brown ...

The larvae damages the crop by feeding on leaves, tender stems flowers and soft seed. On cotton, the larvae bo...

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Insects

  1. Larvae occur in two principle forms: the gregarious (gregaria) form characteristic of high-density populations and the solitarious (solitaria) form found at low larval densities. Intermediate, 'transiens' forms may also be present. Gregarious larvae ...

  2. Adult maize leafhoppers are mostly pale yellow-green and very small (about 3mm long). Two small brown or black spots are found between the eyes on the front margin of the crown of the head. These leafhoppers have two small black spots and brown marks...

  3. The egg is bluish changing to grey before hatching. The body of a newly batched caterpillar is pale cream or greyish-white. Characteristic red markings appear in the second instar and it is this deep red color which makes them easily distinguishable...

  4. The whitefly life cycle begins as yellow-orange, minute cigar-shaped eggs laid on end in groups or clusters usually on the undersides of leaves near the terminal. These eggs are sometimes laid in a circular pattern. The first instar nymph that emerge...

  5. The tomato red spider mite is highly polyphagous, widely spread across the world. Under optimum conditions, it reaches a high population density, and its presence can cause a reduction in crop yield. The adult female red spider mite is very small abo...

  6. Adult tomato leaf miner has a grey-brown colour, about 6 mm in size, a wingspan of 10 mm with silver grey scales. Male leaf miner moths are darker than females. Leaf miner larvae are about 9 mm when fully grown with a pinkish colour on their back. W...

  7. Maize stalk borer larvae is cream to light brown in colour with a dark purple saddle on the front half of the body. Both sides of the larvae head have dark streaks. Head is dark brown and the prothorax is yellowish-brown. Its spiracles (breathing hol...

  8. Maize cutworm larvae are plump, smooth-skinned and greasy in appearance. The body is about 40 mm long with two spotted yellow stripes on the back and colour ranges from grey to dark brown. Fully grown larvae coil up in a c shape and remain motionless...

  9. Fall armyworm larva is brown/grey with distinct tubercles along the body. It has three thin white stripes down the back and a distinct white inverted Y on head. Young larvae may be difficult to distinguish from corn earworm (CEW). Caterpillars are of...

  10. The Bagrada bug adult is black, orange with white markings. It is oftenly found in a mating position. Adult bugs are about 5- 7 mm long with a shield-shaped body. Females lay eggs in the soil beneath host plants but may also oviposit on leaves or on ...

  11. A small, elongated, coloured pale brown moth with a wingspan of 15-17 mm and about 1 cm in length. Front wings are pale brown in colour with small blotches of brown and the hind wings are pale grey. The larvae is 15 mm long, dark brown head and has a...

  12. African bollworm moths have a 40 mm wingspan making them strong fliers. Forewings are reddish-brown and have irregular green lines. Caterpillars/larvae have an elongated creamy-white to reddish-brown body, with a brown head. The back has short fine h...

  13. The adult is a shiny black fly, with clear wings and is about 2 mm in length and 5 mm wide. Adult flies lack a visible head, has red eyes and resembles a house fly in color, but is smaller and more slender. The full grown maggot is white, about 3-4 m...

  14. Adult fruit flies are yellow-brown or brownish black in color and are 3 mm long and 2 mm wide. They have a round head, red compound eyes and short antennae. The female is slightly larger than the male whilst males have a greater amount of black pigme...

  15. Root-knot nematodes are not visible to the naked eye. They are obligate endoparasites that complete their life cycle within root of their host. In soils, nematodes survive as eggs and also second stage larvae. Identified by swollen galls/ knots on th...

  16. Young larvae of the cabbage looper start off as dusky white and hairy and eventually turn green (with a distinct white stripe marked on each side) and hairless as they grow and feed on leaves. The head and thoracic legs are pale green or brown. Larv...

  17. The aphid is small to medium sized, 1.2-2.5 mm long and colour ranges from yellow, all shades of green, to pink, red and almost black. Adult wingless damaging females are oval-bodied, 1.2-2.1 mm in body length, of very variable colour; whitish green...

  18. The maize weevil is a dull red-brown to nearly black winged snout beetle with fine microsculpture and is shiny. The antennae has eight segments and are often carried in an extended position when the insect is walking. The species usually have four pa...

  19. Adult flies are principally yellow and black in color, range 1.25 -1.7 mm in length with black hind margin of the eyes. This is a legless maggot with no separate head capsule, transparent when newly hatched but colouring up to a yellow-orange in late...

  20. Onion thrips are pale yellow (occasionally black), small 'cigar' shaped insects with fringed wings. They are tiny and just visible to the naked eye. There are many different species and most cause injury to plant tissue. A heavy infestation of thrip...

  21. Sorghum shoot fly is similar to housefly but smaller in size (3-5 mm long), greyish in colour, yellow with brown patches on abdomen. The male is more blackish. The larvae or maggots are yellowish or whitish in colour, up to 8 mm long. The full grown ...

  22. Diamondback moth has been recorded everywhere where cabbage is grown and it is highly dispersive. The diamondback moth has four instars. Throughout their development, larvae remain quite small and active. If disturbed, they often wriggle violently, m...

  23. Although the Larger Grain Borer develops best at high temperature and relatively high humidity, it tolerates dry conditions, and may develop in grain at low moisture in contrast to many other storage pests, which are unable to increase in number unde...

  24. Hot, dry weather favours sweet potato weevil development. At optimal temperatures of 27-30 oC. C. formicarius completes development (from egg to adult) in about 33 days. The adult weevil is 5-7 mm long, slender, smooth and hard-bodied ant-like insect...

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