• Sugar beet

  January 1, 1970

  high levels of sucrose. It has a conical, white, fleshy root (a taproot) with a flat crown. The plant consists of the root and a rosette of leaves. Sugar [...] cultivar group of the common beet. Beta vulgaris (beet) is a plant which is included in Betoideae subfamily in the Amaranthaceae family. The root of sugar beets [...] zones. The soil must contain a large supply of plant food, be rich in humus and must retain a great deal of moisture.

• Circular scale

  January 1, 1970

  spots with paler margins, on both surfaces of shaded leaves of the host plant. Life cycle and appearance of Circular scale Female nymphs and adults have [...] tropical and subtropical parts of the world, mostly in association with the citrus industry. In more northern countries of its range, it occurs in greenhouses [...] Chrysomphalus aonidum has a preference for humid environments. In citrus, it tends to prefer the lower and central parts of mature trees. Circular scale prefers

• Eggplant

  January 1, 1970

  or aubergine ( Solanum melongena ) is a specific species of nightshade and is widely produced for its tasty fruit. In North America and Australia the fruit [...] Africa and Southeast Asia it is known as brinjal. The eggplant is a member of the genus Solanum and is thus related to the tomato and potato. Botanically

• Onion thrips

  January 1, 1970

  leaves and the black dots of their excreta indicate their presence in the crop. The vigour of the plant is reduced by loss of chlorophyll. When infestations [...] finally the adult insect. The eggs of the onion thrips (Thrips tabaci) are laid in leaves, flower petals and in the soft parts of stalks. They are inserted into [...] um, gerbera, carnations, bulbs and many others. Life cycle and appearance of Onion thrips Onion thrips (Thrips tabaci) develops in six stages: egg, two

• Tobacco aphid

  January 1, 1970

  therefore need to extract large quantities of sap to get sufficient protein. The excess sugar is secreted in the form of honeydew, making the crop and its fruit [...] they are also capable of dispersing through the crop by walking. The tobacco aphid tends to form denser colonies, closer to the top of the plant, than the [...] viruses. Life cycle and appearance of Tobacco aphid Aphids have a complex life cycle, with both winged and wingless forms of adults and a great variety in colour

• Raspberry

  January 1, 1970

  derive from Rubus idaeus or horticultural derivatives of hybrids of R. idaeus and R. strigosus. The fruit of the raspberry plant is red, tasty and sweet but [...] raspberry to distinguish it from other raspberries, is a red-fruited species of Rubus. This particular plant species has its origins in Europe and northern [...] Botanically speaking, the raspberry is not a berry, but an aggregate fruit of numerous drupelets around a central core.

• Impatiens thrips

  January 1, 1970

  leaves and the black dots of their excreta indicate their presence in the crop. The vigour of the plant is reduced by loss of chlorophyll. When infestations [...] able to spread as a consequence of the trade in foliage plants. Impatiens thrips (Echinothrips americanus) has a wide range of hosts. In addition to many [...] leaf tissue. Adults are found on both upper- and undersides of the leaves. This species of thrips is relatively large. Both males and females are dark

• Pine processionary moth

  January 1, 1970

  during the following summer because of the persistence of allergenic hairs in the remains of winter nests The larvae of the Pine processionary moth cause [...] the viability of oak trees. Life cycle and appearance of Pine processionary moth The female moth has a wingspan of 36-49 mm; the wingspan of the male is [...] serious in young reforested areas where it may lead to death of trees, directly or as a consequence of attack by bark beetles or other wood-boring insects. In

• Large raspberry aphid

  January 1, 1970

  damage. The major problem is the spreading of various raspberry viruses by the aphids. Life cycle and appearance of Large raspberry aphid Aphids have a complex [...] cauda is short and triangular. Overwintering eggs of the large raspberry aphid are laid near the base of vegetative canes and hatch in spring. After emerging [...] complex life cycle, with both winged and wingless forms of adults and a great variety in colour. In greenhouses, reproduction takes place by parthenogenesis

• Large blackberry aphid

  January 1, 1970

  blackberries. Damage symptoms High populations of large blackberry aphids can reduce yield. Life cycle and appearance of Large blackberry aphid Aphids have a complex [...] complex life cycle, with both winged and wingless forms of adults and a great variety in colour. In greenhouses, reproduction takes place by parthenogenesis [...] with unfertilized viviparous females continuing to produce new generations of females. Aphids moult four times before reaching adulthood. With each moult