http://216.239.59.104/search?q=cache:eewcp2MgT-4J:www.lubes-...

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Note added at 4 days (2008-06-17 08:54:13 GMT) Post-grading
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Hi

In light of Thierry's comment, I thought it would be a safe idea to send in more refs:

The actual query is WP60 (no percentage quoted).

[PDF]
2005 2005 Pesticide Directory
File Format: PDF/Adobe Acrobat
WP, 60% WDG. China Jiangsu Int Econ Tech. Coop Corp. Bentazone (bentazone) Tech 95% ...... 100% technical, 50% wettable powder or 25%. emulsion concentrate. ...
www.researchinformation.co.uk/IPDI2005.pdf - Similar pages

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Note added at 4 days (2008-06-17 08:54:58 GMT) Post-grading
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Agricultural chemicals are widely used nowadays to safeguard the growth and yield of crops, and are usually applied by airplane to cover large areas under cultivation. To minimize the costs involved, every effort is made to keep the quantities of water required for diluting the commercial concentrates as small as possible and to apply high concentrations of active compounds in small amounts. Today, quantities of 5-50 liters/ha are applied by the low-volume (LV) method using known commercial products, such as wettable powders (WP), suspended concentrates (SC) or solvent-containing emulsifiable concentrates (EC) which are normally sprayed in suspension in 300-600 liters of water/ha using ground appliances.

The smaller the quantities of spray mixture applied per unit area, the finer the droplets applied have to be to obtain satisfactory coverage of the crops. This plus the high concentration of the spray mixtures has hitherto created the main obstacle to application of the low-volume method, particularly under sub-tropical and tropical climatic conditions, namely, the water evaporates too quickly due to the large surface area of the fine droplets, so that the active compound can readily be carried away by the wind. Losses are incurred through drifting and, depending on the plant protection agent used, may even cause damage to adjacent crops. Accordingly, exact dosage is difficult, particularly where the spray mixtures are applied from aircraft. Damage to the environment or losses of crop yield may have to be accepted.

In addition, heavy foaming can occur during preparation of the spray mixture with the greatly reduced quantities of water, because the dispersants and wetting agents in the wettable powders or concentrated dispersions are then present in correspondingly higher concentrations. The product foams out of the spray tanks unless the filling level is greatly reduced.

The above spray mixtures of agricultural chemicals are prepared from commercial concentrates by dispersion or emulsification in the desired quantity of water. The concentrates are either self-emulsifying solutions in an organic solvent (EC) or wettable powders (WP) or suspended concentrates (SC).

The agricultural chemicals used can be one or more of insecticides, fungicides, virucides, herbicides, acaricides, dessicants, growth regulators, ripening accelerators, repellents, pheromones, leaf fertilizers, defoliants, etc. In addition, the concentrates can optionally contain dispersants, emulsifiers, wetting agents, defoamers, stickers, carriers and pigments for obtaining a marking effect.

An object of the present invention is to reduce the evaporation of water in the low-volume method of applying agricultural chemicals in the form of spray mixtures. Measures in that direction are the subject of German Application No. 22 05 590, although the mineral-oil-based evaporation inhibitors claimed therein are not sufficiently effective under sub-tropical and tropical climatic conditions. In addition, it is known from U.S. Pat. No. 3,791,839 that the release of water from living plants, particularly during growth in dry climates, can be reduced by applying to the surface of the plants an aqueous emulsion which, in addition to paraffin wax and emulsifier, contains vaseline-like hydrocarbons (petrolatum) as an essential ingredient. However, the function of these emulsions is not to reduce the evaporation of spray mixtures of plant protection agents during spraying by the low-volume method.

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Note added at 4 days (2008-06-17 08:56:00 GMT) Post-grading
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Presently different formulations of synthetic chemical insecticides are in the use for vector control. Wettable powder (WP) formulations are used for indoor residual sprays while emulsion concentrate (EC) formulations are used for larval control. For Indoor Residual spray (IRS) insecticides in use are DDT 50% WP, malathion 25% WP and synthetic Pyrethroid (WP). Synthetic Pyrethroids include deltamethrin 2.5% WP, Cyfluthrin 10% WP, lambdacyhalothrin 10% WP, alphacypermethrin 5% WP, Etofenprox 10% WP and Bifenthrin 10% WP. Synthetic pyrethroid insecticides are also used for impregnation of bed nets.

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Note added at 4 days (2008-06-17 08:58:49 GMT) Post-grading
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AND

it would seem that "white oil" is used in cosmetics, rather than pesticides:

Presently different formulations of synthetic chemical insecticides are in the use for vector control. Wettable powder (WP) formulations are used for indoor residual sprays while emulsion concentrate (EC) formulations are used for larval control. For Indoor Residual spray (IRS) insecticides in use are DDT 50% WP, malathion 25% WP and synthetic Pyrethroid (WP). Synthetic Pyrethroids include deltamethrin 2.5% WP, Cyfluthrin 10% WP, lambdacyhalothrin 10% WP, alphacypermethrin 5% WP, Etofenprox 10% WP and Bifenthrin 10% WP. Synthetic pyrethroid insecticides are also used for impregnation of bed nets.

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Note added at 4 days (2008-06-17 09:00:32 GMT) Post-grading
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But, this site says "white oil" can be used as an insecticide spray in the garden:

http://216.239.59.104/search?q=cache:QUJ53iKeOVcJ:www.made-i...

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Note added at 4 days (2008-06-17 09:01:57 GMT) Post-grading
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AND

agricultural oil (an outdated,nolongerrecommended term)
—a petroleum product either applied directlyonplants
as a pesticide or used as an adjuvant to enhance the
effectiveness of a pesticide.A good agricultural oil had
low volatility for longer adherence to leaf surfaces,low
surface tension for better surface coverage and easier
atomisation, and low water solubility to resist rain
washoff.There were2 basic types:orchard spray oil and
cropoil.The former had low phytotoxicity,accomplished
by controlling molecular weight within optimal limits
and by maximising unsulfonated residue content.Crop
oils were lower in quality and commonly used as
adjuvants in herbicide spray formulations.

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Note added at 4 days (2008-06-17 09:03:40 GMT) Post-grading
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white oil—highly refined straight mineral oil, essentially
colourless, odourless and tasteless (the term refers to
Page 18
620
SPRAY OILS—BEYOND 2000
water white, not milk white). White oils have a high
degree of chemical stability. The highest-purity white
oilsare free of unsaturated components (UR > 99% and
no detectablearomatics) and meetthe standards of the
United States Pharmacopeia (USP) for food,medicinal
and cosmetic applications.White oils not intended for
medicinal use are known as technical whitemineral oils
and have many industrial applications—including
textile,chemicaland plastic manufacture—where their
good colour, non-staining properties and chemical
inertness are highlydesirable.Tobeclassed astechnical
whitemineral oilsproducts mustmeetthe requirements
of the United States Food and Drug Administration
(FDA) regulation 21CFR178.3620(b) (see mineral oil).
To be classed as food-grade white oils products must
meet the requirements of FDA regulation 21CFR178.

On balance, I think Thierry is correct here...and you have chosen the wrong answer :-)