Best practices

Angular leaf spot

symptoms Xanthomonas fragariae initially causes small, water-soaked lesions on the underside of the leaf. They enlarge to angular spots, often limited by [...] translucent. When conditions are humid, a viscous bacterial exudate forms on the underside of the leaf. This exudate changes to a white film when it dries [...] dries. Lesions may merge as they grow and later also become visible on the upper side of the leaf as irregular spots which are first reddish brown and then

Pierce's disease of grapevine

desiccation of twigs and small branches occur on infected leaves. This usually starts in the upper part of the canopy on a few branches and then extends to the [...] young infected trees show dwarfing. Leaves and flowers appear early and remain on the plant longer, but fewer and smaller fruits are produced. In plums, the [...] certain branches. When the leaves mature, slightly raised gummy lesions occur on the underside of the leaves. These lesions start out in a light-brown colour

Impatiens thrips

Pupation occurs on the leaf rather than on the ground. The prepupae and pupae remain immobile on the leaf tissue. Adults are found on both upper- and [...] from egg to adult on the plant, specifically on the leaves. Eggs are deposited in the leaf tissue, while subsequent stages are found on the upper- and undersides [...] sweet pepper, cucumber and eggplants. It lives exclusively on the leaves and is often present on weeds in greenhouses. Life cycle and appearance of Impatiens

Box tree moth

perspectalis ) feed on the leaves of box trees, but can also attack the bark of the trees, causing them to dry out and die. Damage on a box-tree most often [...] gelatinous mass on the leaves of box trees. The light green larvae have black stripes with white dots and hairs and a black head. Depending on environmental [...] margin and a characteristic white spot on the forewing, while the other is mostly light brown with a white spot on the forewings. The adult moths are good

Leek moth

can occur. On leeks, larvae mine the central leaves which have long, longitudinal grooves when growing. On onion leaves, the larvae feed on the parenchyma [...] leaves. On reaching the third instar, the larva penetrates the young leaves, the flower stalk or the inflorescence of the host plant. Feeding on the leaf [...] plant can occur. On old leaves, open galleries can be seen which decrease the economic value of the plant. Severe damage also occurs on inflorescences of

Addit

Improves the effect of Mycotal and entomopathogenic nematodes. Crops Do not use on kalanchoe plants. Mode of action Addit improves the spread of plant protection [...] product. Dosage 125–250 ml per 100 litres of water (0.125-0.25%), depending on local registration. Compatibility Do not mix Addit with other additives. Addit

Bacterial wilt, brown rot

the plants may show signs of stunting and produce many adventitious roots on the stem. The vascular stem tissue is coloured brown and when the stem is [...] temperate regions. It survives well in water and in many different soil types and on alternative hosts like weeds. It invades the plants through wounds or stomata [...] cutting knives and tools Control root rot nematodes as the wounds they make on roots help the bacteria to infect the crop Do not use cut potatoes for propagation

Crazy roots, hairy roots, crown gall

galls on the stems, which are first white and later turn brown. Only Rhizobium radiobacter causes galls and tumours on underground plant parts and on the

Hemispherical scale

shiny brown domes on leaf undersides close to the midribs. They produce large amounts of honeydew causing build-up of sticky deposits on nearby surfaces [...] depends on the host plant and can vary from 2 to 4.5 mm. The young nymphs are white to yellowish, more oval in form and with a raised H-pattern on the dorsal [...] instars live on the underside of leaves, often close to the midrib. Only when an infestation is particularly severe do individual scales appear on stems, branches