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2 edition of glasshouse whitefly and its parasite found in the catalog.

glasshouse whitefly and its parasite

Gamal El-Din Amin Ibrahim

glasshouse whitefly and its parasite

the effect of temperature, light intnsity and type of host planton the longevity and fecundity of trialeurodes vaporariorum and on the efficiency, longevity and fecundity of its chalcid parasite encarsia formosa.

by Gamal El-Din Amin Ibrahim

  • 58 Want to read
  • 40 Currently reading

Published by The author in Bradford .
Written in English


Edition Notes

Ph.D.thesis. Typescript.

SeriesTheses
The Physical Object
Pagination147p.
Number of Pages147
ID Numbers
Open LibraryOL21504716M

The parasites are introduced into glasshouses as pupae; this is a resilient stage protected by the larval skin of the whitefly. Introduction of E. formosa when greenhouse whitefly densities are low is of paramount importance for successful control. Biological control of whitefly, biology of Trialeurodes, Bemisia, Encarsia, entomopathogens and other biocontrol agents This has been one of the largest research projects of my research group.

Biological cycle of Whitefly. The full life cycle of the whitefly lasts between 15 to 40 days, depending on environmental conditions, particularly the temperature, as eggs will turn into adults more quickly when the temperature is higher. The whitefly usually lays its eggs on the underside of the leaves and the eggs stick to them. Symptoms of a.   Using neem oil on your plants will deter whiteflies from laying eggs on them. In addition, the oil will coat the eggs and larvae and smother them. Be sure to thoroughly coat both the bottoms and tops of the leaves as well as their stems for complete coverage. Try mulching with a reflective mulch fabric. Reflective fabrics are confusing to.

Biological cycle of Whitefly. The full life cycle of the whitefly lasts between 15 and 40 days, depending on environmental conditions, particularly the temperature, since eggs will develop into adults more quickly when the temperature is higher. The whitefly usually lays its eggs on the underside of the leaves, which the eggs stick to. Your Whitefly Parasites arrive packaged, ready to hatch, glued to small, perforated cards which you hang among plant foliage. Parasites work best when temperatures average at least 68 F. (add daytime & nighttime temperatures and divide by 2). Parasites emerge as adults within 2 weeks and fly off to hunt for more Whitefly pupae to parasitize.


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Glasshouse whitefly and its parasite by Gamal El-Din Amin Ibrahim Download PDF EPUB FB2

Glasshouse whitefly is a sap-sucking true bug that can reduces the vigour of plants and excretes a sticky, sugary substance, called honeydew, on the leaves, stems and fruits of its host plants. It attacks many vegetables and ornamental plants grown in greenhouses as well as house-plants.

The glasshouse whitefly and its parasite Author: Ibrahim, G. ISNI: Awarding Body: University of Bradford Current Institution: University of Bradford Date of Award: Availability of Full Text: Access from EThOS.

1.— Encarsia formosa, Gahan, is a Chalcid wasp that parasitises the white-fly, Trialeurodes vaporariorum, Westw., a single female ovipositing in 50 or more young pupae of the larvae of the parasite, on hatching glasshouse whitefly and its parasite book the egg, destroys the white-fly pupa, the skin of which becomes black in colour, thus distinguishing the parasitised pupa from the normal white scales and Cited by: A method of mass‐producing the glasshouse whitefly, Trialemodes vaporariorum, and its parasite Encarsia formosa on Nicotiana tabacun is described.

Whiteflies of known age are produced for introducing into glasshouses before the introduction of the parasite.

They are also produced for stock multiplication of the parasite. Prevent greenhouse whitefly from establishing on seedlings, cuttings, etc. Biological control. A variety of natural enemies (predators, parasites and diseases) has been researched for the management of greenhouse whitefly.

The parasite (parasitoid), Encarsia formosa is the most commonly used biological control agent for this pest. Trialeurodes vaporariorum, commonly known as the glasshouse whitefly or greenhouse whitefly, is an insect that inhabits the world's temperate regions.

Like various other whiteflies, it is a primary insect pest of many fruit, vegetable and ornamental is frequently found in glasshouses (greenhouses), polytunnels, and other protected horticultural : Aleyrodidae.

Grower Books, London, 56 pp. Google Scholar. Hussey. () Monitoring the activity of tomato Ieafminer (Liriomyza bryoniae Kalt.) and its parasites in commercial glasshouses in G. and Jackson, A. () Pesticide resistance in glasshouses.

Pesticide resistance in glasshouse whitefly (Trialeurodes vaporariorum (Westw Cited by: Whitefly. There are 2 main species present in New Zealand, Greenhouse Whitefly (Trialeurodes vaporariorum) and Citrus Whitefly (Orchamoplatus citri).

Whiteflies are small white sap sucking insects mm in length that resemble miniature moths with a wingspan of around 3mm. Both the nymphs and the adult insects are sapsuckers. Whitefly Damage to Plants Whiteflies suck phloem sap and large populations can cause leaves to yellow, appear dry, or to fall off of plants.

Due to the excretion of honeydew plant leaves can become sticky and covered with a black sooty mold. Glasshouse whitefly is another common problem that can be controlled with a small parasitic wasp, Encarsia formosa.

Spot the glasshouse mealybug from its Author: RHS Advisory Service. The changes in numbers and distribution of greenhouse whitefly and its parasite were followed for 16 weeks in a glasshouse of m 2 contain tomato plants.

Two methods were used: weekly counts of pupae on all infested plants and a stratified random sampling program whereby % of the plants were checked each week. Whiteflies are harmful to both outdoor and indoor plants by sucking plant sap.

Under certain conditions, they can also transmit disease. The whitefly parasite (Encarsia formosa) lays its eggs — as many as 50 to — in both pupae and later larval stages of the white fly, destroying them before they can become host larva turns black as the parasite develops.

Whitefly - Pests & Diseases The two species of whitefly that affect many crops are Bemisia tabaci or tobacco whitefly and Trialeurodes vaporariorum or glasshouse whitefly. The main morphological difference that enables these insects to be distinguished from one another is the position of the wings.

The adult Glasshouse Whitefly holds its wings in a tent-like fashion over the body, hiding the body and giving it a triangular outline. This is in contrast to Bemisia tabaci, adults of which hold the wings alongside the body, revealing the yellow body colour and giving them an elliptical profile.

Adults of T. vaporariorum generally settle on young foliage close to the growing point of the. generations. At 15 c (59 f) glasshouse whitefly takes about 55 days to complete its life cycle from egg to adult, but at 25 c (77 f), it takes half that time. This rapid reproduction rate, and the potential repeated use of pesticides, can lead to pesticide resistance building up.

There are two strategies for glasshouse. • Do all rough work in this book. Cross through any work you do not want marked. Information glasshouse whitefly and its wasp parasite.

The results are shown in the graph. (3 marks) (ii) The wasp parasite could be used as a biological control agent for the glasshouse whitefly. The parasite's introduction to the crop is most successful when the whitefly levels are low (recommended less than one whitefly per 10 plants). Its mobility (about 5 m) and successful parasitism are most effective at temperatures greater than 22°C when its egg-laying ability exceeds that of the whitefly.

4 PRIMEFACTWHITEFLY MANAGEMENT IN GREENHOUSE VEGETABLE CROPS. locations to consider hanging traps would be near doors, vents and previously known hot spots. Biological control. There are natural enemies of whiteflies.

Some are naturally occurring parasitoid wasps and pathogenic fungi. These are probably more accessible to a field. Find the perfect whitefly stock photo. Huge collection, amazing choice, + million high quality, affordable RF and RM images.

No need to register, buy now. Greenhouse whitefly Trialeurodes vaporariorum (Westw.) (Hom., Aleyrodidae) in Japan and possibilities for its control by Encarsia formosa Gahan (Hym., Aphelinidae) January Journal of Applied Author: Eizi Yano.

The glasshouse whitefly Trialeurodes vaporariorum, the tobacco whitefly, Bemisia tabaci, and the cabbage whitefly, Aleyrodes proletella are pests of considerable economic importance (Danzig, ; Mound and Halsey, ; Bink-Moenen, ).

They feed on the plant sap, and, when present in sufficient numbers, can cause leaf by: Insecticide Resistance in the Glasshouse Whitefly: Resistance to conventional and novel insecticides in Trialeurodes vaporariorum.

by Kevin Gorman (Author) ISBN ISBN Why is ISBN important? ISBN. This bar-code number lets you verify that you're getting exactly the right version or edition of a book. Author: Kevin Gorman.Selected life history characteristics of Encarsia formosa Gahan parasitizing the castor whitefly, Trialeurodes ricini (Misra) were studied at three constant temperatures (20, 25 and 30°C).

Egg-to-adult developmental time decreased from 32 days at 20°C to 13 days at 30°C. An average of day-degrees was required to complete development above the lower threshold temperature (12°C).Cited by: 8.