Even a small area of a favoured host can maintain a significant whitefly population.Minimising whitefly hosts is important in reducing the base population at the start of the cropping season.
Bemisia tabaci biotype Q ; Bemisia tabaci Q ; Mediterranean (MED) species (Bemisia tabaci) (Gennadius, 1889) International Common Names.
Adults congregate and lay eggs predominantly on the undersides of younger leaves.
Whitefly control is difficult and complex, as whiteflies rapidly develop resistance to chemical pesticides.The USDA recommends "an integrated program that focuses on prevention and relies on cultural and biological control methods when possible".
Emergence is temperature dependant with earlier emergence at higher temperature.
Adults hold their wings vertically tilted, like a peaked roof.
They have white wings and yellow bodies, and congregate on the undersides of leaves. Silverleaf whitefly (SLW) is considered a major pest of cotton due to resistance issues and the difficulty in processing lint contaminated with SLW honeydew.
Therefore it is important to control adult whiteflies before they move into young crops.Selecting the correct insecticides and applying them at the appropriate time is very important, both for achieving good SLW management and minimising the development of resistance to the insecticides. Avoid early-season use of broad spectrum insecticides, particularly pyrethroids and organophosphates. Very high populations can develop within three to four weeks.The oblong eggs are smooth and about 0.2 mm long and 0.1 mm in diameter. Soil applications are more efficient than foliar sprays and are made shortly before, at or shortly after planting.Short residual contact insecticides mainly control adults and are less effective against immature stages. Growers should check their suppliers to determine how the seedlings are grown and what measures are being used to protect against whitefly infestation. Trialeurodes vaporariorum. MED; Summary of Invasiveness Top of page . Topics:
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A smaller base population then will delay the time it takes for SLW numbers to reach significant levels, reducing the number of sprays needed to control whitefly.Common weed species that carry high numbers of SLW include sow thistle, bladder ketmia, bell vine, burr gherkin, native rosella and star burr.
Description.
Milk or sow thistle is a regular weed host for whitefly and is common in Queensland vegetable production areas.
Description of adult: Adult silverleaf whitefly are small 0.8 to 1.2 mm long (smaller than greenhouse whitefly), sap sucking, flying insects. Scientific name: Bemisia tabaci Biotype B, Q and AN. SLW is a serious pest of many vegetables including cucurbits, tomatoes, eggplant, brassicas, lettuce and beans. Topics:
Good spray coverage, particularly of the underside of leaves, is very important when using foliar insecticide applications as SLW adults, eggs and nymphs are found predominantly on the underside of leaves. Rapid adult migration usually occurs when infested crops are in decline or about to be destroyed.To assess nymph populations, sampling should focus primarily on the older leaves.
Around three to five traps should be placed in a crop of 2-3 ha. Adults should be sampled during early morning (7-9 a.m.). There is also an Australian native species. The majority of the eggs and young nymphs are found on the young leaves while older nymphs are usually found on older leaves.To determine the numbers of adult SLW gently turn over young leaves and count the adults on the underside.
Consult the cotton industry's integrated resistance management strategy (IRMS) and other management information in the Conservation of natural enemies and good crop hygiene are key components in SLW management. Greenhouse whitefly adults are larger than Bemisia tabaci (silverleaf whitefly) ... Scientific name.
The eggs have a pointed end that is attached to the underside of the leaf surface.
Adult numbers on the traps will give an early warning of population increases within crops and an indication of the need for regular monitoring for nymphs.Controlling whitefly populations before they reach large numbers in crops is very important for successful management.
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