• Cutworms

  instars is usually observed as a cutting of young seedlings, often causing death of the cut seedlings. Sometimes wilting is observed because of partial [...] flow in the plant. Life cycle and appearance of Cutworms The adults of Agrotis spp. have pale grey to grey-brown forewings with a faint kidney-shaped marking [...] for instance the black cutworm Agrotis ipsilon and the turnip moth Agrotis segetum . The larvae of these moths usually feed on roots and plant parts close

• Long-tailed mealybug

  length of the other filaments is roughly half the width of the body. The female is 3 - 4 mm long. Reproduction in Pseudococcus longispinus , may be sexual or [...] occurs naturally in tropical and sub-tropical regions, but these days it is widespread throughout the world. The range of host plants of Pseudococcus longispinus [...] defoliation. The overall effect is a reduction of photosynthesis and therefore the yield. Flowers and fruit often drop off. Plant sap is rich in sugars, but

• Hop

  About The hop is a small genus of flowering plants in the family Cannabaceae. Hops are the female flowers (seed cones, strobiles) of the plant and are [...] ft tall. The hop is native to the temperate Northern Hemisphere where currently the most acreage of production occurs. Although these plants have a very [...] cycle, with the continued popularity of microbrews across the globe, genetics for flavoring have dictated how long these plants stay in the ground. They

• Black rot of carrots

  spores surviving in the soil are the main source of infection. Especially wheat and barley reduce the number of surviving conidia in the soil. Use resistant [...] General The only known stage in all Alternaria species is the asexual stage. Conidia and mycelium overwinter in the soil and on crop residues and cause [...] cause primary infection of the leaves. Survival can be several years, in the case of black rot of carrots ( Alternaria radicina ) up to 8 years. Damage symptoms

• Glasshouse potato aphid

  deformations in the growing tip of the plant. Precisely where the plant is pierced is unimportant. The piercing of the lower leaves in the crop can cause [...] lifecycles. There is no alternation of hosts, and the two types of life cycles occur on the same host plant. The aphid can overwinter not only in greenhouses [...] leaves and curled leaf margins. The immediate effects of piercing by the aphids are visible in lower leaves in the form of yellow patches. Heavy yellowing

• Tarnished plant bug

  General The lygus bug (or tarnished plant bug) is native to North America, and it is especially common across the eastern half of the continent, from northern [...] flowers of plants, piercing them with their needle-like mouthparts, injecting enzyme-filled saliva to break down the plant tissue and sucking out the contents [...] Terminal plant growth is yellowed and distorted; Plants develop split-stem lesions; Nodes swell and internodes become elongated; The number of vegetative

• Western flower thrips

  finally the adult insect. The eggs of the western flower thrips (Frankliniella occidentalis) are laid in leaves, flower petals and in the soft parts of stalks [...] disturbed. In the adults both pairs of wings are fully developed. Damage symptoms Thrips cause damage to plants by piercing the cells of the surface tissues [...] crop. The vigour of the plant is reduced by loss of chlorophyll. When infestations become serious the leaves themselves can shrivel. Western flower thrips

• American serpentine leaf miner

  exit hole in the leaf with its mouth parts. After roughly one hour the larva crawls out of the leaf and falls to the ground. This occurs in the early morning [...] full-grown plants of fruiting vegetable crops, however, a considerable quantity of foliage can get damaged before the harvest is affected. The older larvae make [...] criterion for the identification of the species. Indirect damage arises when disease causing fungi or bacteria enter the plant tissue via the feeding spots

• Potato

  integral part of the world’s food supply and many people’s diet. In terms of volume, potato is the fourth-largest food crop in the world, after maize, wheat [...] About The word ‘potato’ ( S olanum tuberosum ) is used to refer to the plant itself or its edible tuber. The plant is an herbaceous perennial and came [...] Latin America in the second half of the 16th century. Potatoes as a food crop were introduced by the Spanish. Now this starchy, tuberous crop is an integral

• Tomato russet mite

  out quickly. The damage is first seen on the lower part of the plant and moves upwards as the mites ascend. Life cycle and appearance of tomato russet [...] time in 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 [...] symptoms Damage is caused by the mites sucking out the contents of plant cells. Affected leaves are slightly curled and acquire a silvery sheen on the underside