Angular leaf spot

look when using different light sources: when reflected light is used, the lesions look dark green, but when transmitted light is used, they are translucent

Black sigatoka disease

symptoms Black sigatoka (Mycosphaerella fijiensis ) first causes small, light yellow spots or streaks on leaves of about one month old. The symptoms run [...] few days, the spots become a few centimetres in size and turn brown with light grey centres. These spots enlarge further and the tissue around the lesions

Fall Armyworm

spread over large areas rapidly. Adults fly by night, and are attracted to lights, especially those with a strong ultra-violet component. Damage symptoms [...] 150-200 and can lay up to 2000 eggs in a lifetime. Eggs are white, pinkish or light green and spherical, and are usually laid on the underside of the leaves [...] caterpillars ) are 30-40 mm long. They have six instars that vary in colour from light tan to green to black. They have a distinct white inverted Y-shaped mark

Diamond back moth

of the forewings are light ochreous and the markings are like those of the males. The back is marked with a broad cream or light brown band along the back [...] back, which is sometimes constricted to form one or more light-coloured diamonds, thus the common name diamond back moth. The moths are weak fliers and

Two-spotted spider mite

that is rounded at the rear end. Their colour can vary from orange, light yellow or light green to dark green, red, brown, or almost black.

Trianum effectively controls Pythium in cucumber

sections. Hendriks grows high-wire (two crops per year) under high-intensity lighting (190 micromol). He sells his cucumbers to some major retailers in the [...] response to his crop’s susceptibility to Pythium. ‘My crop gets 20 hours of light a day, which means it requires a lot of water. That larger quantity of water [...] another situation like that.’ The crop receives 20 hours of high-intensity light every day, which makes it susceptible to Pythium. A very acceptable level

Cotton aphid

always black, whatever the body colour, which can vary widely, from light yellow to light green, or even a green-black colour . This body colour depends on

Pea blight, leaf and pod spot

and pods are round, on the stems they are more elongated. The lesions are light brown, sunken and surrounded by a dark brown to red-brown border. The first

Bacterial soft rot, bacterial stem rot

colour. On the fruits, lesions first are small and sunken, water-soaked and light to dark brown. They are adjacent to wounds and natural openings at the stem

Onion thrips

are inserted into the plant tissue with a saw-like ovipositor. Larvae are light to yellowish green in colour, with a large head and bright red eyes. The