• Mottled arum aphid

  green with black cross bands behind the head, broken along the midline, and a large horseshoe-shaped spot on the back of the abdomen. These black markings can [...] large amounts of honeydew, which provides an excellent substrate for the growth of black sooty mould. Large areas of mould covering the leaves can reduce [...] producing new generations of females. There is no sexual stage in the life cycle. Wingless females of the mottled arum aphid are shiny whitish, yellowish

• Large blackberry aphid

  Wingless females of the large blackberry aphid are 2.6-4.1 mm long, pale to yellowish green with long antennae, legs and siphunculi. The cauda is short and [...] and triangular. The aphids overwinter as eggs on blackberry plants. After emerging in spring, the aphids mainly feed on the underside of leaves and start [...] General The large blackberry aphid, Amphorophora rubi , is very similar to the large raspberry aphid Amphorophora idaei . As both aphid species are host specific

• Fusarium head blight or scab

  density. The foot of the plant is infected, either because the seedling was infected or by direct infection of the foot by overwintering inoculum. On the infected [...] Fusarium is a group of soil-borne fungi with many different species. Fusarium is widespread and can infect a range of host crops. Many species are considered [...] conidia are produced that further spread the disease. Gibberella zeae (Fusarium graminearum ) primarily infects the older, lower leaves. The spores are dispersed

• Damping-off

  or substrate the plant turns brown. A typical symptom of a Pythium infection is the easy stripping of the skin from the root cortex with a finger nail. [...] later the plants wilt irreversibly. In potted plants the flower buds fall off. The side roots rot and very little of the root system survives. On the border [...] Life cycle and appearance of Damping-off Pythium belongs to the Oomycetes, a separate group of microorganisms and is therefore not a real fungus. It survives

• Peach twig borer

  those of the second generation in late July and August. Eggs are laid on the base of leaves and hatch after about 2 weeks. The larvae bore into the young [...] shoots during the course of their development. The larvae may also attack the fruits where they tunnel through the flesh and bore into the stone. Fully [...] quantities of gum. Attacks on fruits can cause significant yield loss. Life cycle and appearance of Peach twig borer The moths have a wingspan of 12-16 mm

• Small bramble aphid

  other blackberry bushes. The colour change from spring to summer seems to be related to the colour of leaves and stems of the host plants but this does [...] cycle and appearance of Small bramble aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colours [...] Asia. It is a pest of blackberry and is also found on loganberry and rarely on strawberry. Damage symptoms The dense colonies appearing is early summer

• Blackcurrant aphid

  distal third of the siphunculi is slightly swollen. In spring, the blackcurrant aphid lives on the underside of the young leaves of currant plants. It does [...] females of the blackcurrant aphid are 1.3-2.6 mm long and pale greenish white or sometimes yellowish, often with a darker green spinal stripe. The distal [...] cycle and appearance of Blackcurrant aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colour

• Tomato moth

  fruit. The second generation of larvae often causes greater loss of fruit than the first. Life cycle and appearance of Tomato moth The forewings of adult [...] oleracea) are a reddish-brown with a feint light brown, kidney-shaped marking, and a thin, toothed white line along the posterior edge of the forewing. [...] moths, the hindwing is greyish and lighter than the forewing, with a darker shadow at the margin. The antennae are long and thin. Head and thorax are red

• Black bean aphid

  caused through the transmission of plant viruses. Infestations start usually at the younger parts of the plant but can spread all over the plant. Nymphs [...] from the plant and disturb the balance of growth hormones. As a result, the plant’s growth is retarded giving rise to deformed leaves or, if the infestation [...] black with black bands across the back. The two cornicles (or siphunculi) are short and usually darker than the body. The legs are light yellow with darker

• Leaf miners

  before the harvest is affected. The size of a leaf tunnel depends on the stage of development of the leaf, the species of host plant and the species of leaf [...] more about What are leaf miners? Leaf miners belong to the order Diptera (the true flies ) and form the family Agromyzidae. This is a family of small flies [...] tunnel into the leaves of plants, creating ‘mines’. There are many species of leaf miner affecting various crops in temperate parts of the world. Under