• Glasshouse potato aphid

  the cornicles. Alate (winged) females are yellow-green, with a brown head, a dark thorax and a dark abdomen that has pale to dark transverse bands. The body [...] cycle Glasshouse potato aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colour. When reproduction [...] greenhouse potato aphid is rather squat, of medium size (1.8 - 3.0 mm long) and oval in shape. It has a light yellow-green to brown-green colour, and has an

• Greenhouse whitefly

  symptoms The larvae of whitefly need a lot of protein for growth, and thus consume a large quantity of plant sap. This contains a high proportion of sugar, and [...] flattened on the leaf. The fourth larva stadium develops into a white, oval case encircled by a ring of erect waxy rods. This is called the pupa stadium and [...] larger larvae expelling large quantities. The damage that whiteflies cause to a crop is the result of sucking out the sap from the plant leaves and secreting

• Beetles

  orders and displays an enormous variety of form, size and habit. A number of species are a serious pest in crops or stored products. There are many useful [...] aphids . Beetles undergo a complete metamorphosis, that is, the larvae do not resemble the adult at all, and must pass through a pupal instar before reaching [...] The pupae do not make a cocoon and will already display many similarities with the adults. The adult beetles usually possess a pair of membranous wings

• Tobacco whitefly

  symptoms The larvae of whitefly need a lot of protein for growth, and thus consume a large quantity of plant sap. This contains a high proportion of sugar, and [...] and subtropical countries of the world. The original habitat was probably a tropical or subtropical area, possibly Pakistan. The tobacco whitefly ( Bemisia [...] larger larvae expelling large quantities. The damage that whiteflies cause to a crop is the result of sucking out the sap from the plant leaves and secreting

• Fall Armyworm

  13 to 17 mm in length. The eggs hatch after 3-5 days. Over the next 2 to 3 weeks, the larvae pass through 5-6 stages and the pupal stage takes 9-13 days [...] General The fall armyworm is a polyphagous pest that is indigenous throughout the Americas. Recently, it has been found in Africa too. The caterpillars [...] millet, tomato, potato and cotton. Fall armyworm moths generally disperse in a radius of about 500 km (300 miles) before oviposition, which is sufficient

• Tomato pinworm

  after being laid. The larvae have a yellowish-grayish body, changing to gray with purple spots or completely purple, with a dark brown head. In total, the [...] itself and creating a green pupal cell which darkens to brown before emergence of the adult. The number of days in this instar varies a great deal since it [...] shares similar habits. Due to the initial damage of the larva which forms a mine, it can be confused with the eggplant leafminer (Gnorimoschema glochinella)

• Tomato russet mite

  The first nymphal stage is a transparent white colour and about 0.1 mm long. They usually develop to the 2nd stage within a day. All life stages look very [...] Australia and is a pest in tomatoes in all areas where they are grown. Other members of the plant family Solanaceae may be affected to a lesser extent. Damage [...] creamy white but turn to a patchy yellow as they age. The mites have two nymphal stages: sometimes they are also called larva (1st stage) and nymph (2nd

• Cotton aphid

  appearance of Cotton aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colour. In greenhouses [...] or even a green-black colour . This body colour depends on temperature, food source and the density of the population. Large individuals (up to 1.8 mm long) [...] distributed throughout the world but prefers the warmer regions. It has been a pest in European greenhouses since the late 1980’s, particularly affecting

• Asian citrus psyllid

  citri ), is an important pest of citrus in several countries as it is a vector of a serious citrus disease called greening disease or Huanglongbing. It is [...] disease is spread when adults fly to a healthy plant and injects bacteria into it as they feed. The disease can kill a citrus tree in as little as five years [...] most affected area by the vectored disease. Damage symptoms The psyllid is a sucking insect that inserts its mouthparts into plant tissue to feed. Adults

• Garden chafer

  larval instars, a pupal instar and the adult beetle. Adult garden chafers ( Phyllopertha horticola ) have red-brown slightly hairy wings with a dark edge. The [...] close to the ground. Females start to deposit eggs into the soil at a depth up to 5 cm soon after mating. The eggs elongate at laying but in time become [...] General The garden chafer ( Phyllopertha horticola ) is a beetle from the Scarabaeidae family. It does most of its damage in the larval stage when it feeds