Adjuvant Newsletter
Editor in Chief: Hans de Ruiter Volume 7 – Issue 5 – May 2010
Contents: Polysaccharide bas...
Adjuvant Newsletter – May 2010 - page 2
A single TeeJet TP 11003 VP nozzle was
used at 2 bar pressure (V...
Adjuvant Newsletter - May 2010 - page 3
Enhancer of increasing pesticide products efficacy (I). Agrochemicals (...
Adjuvant Newsletter - May 2010 - page 4
Surfactants increase uniformity of soil water content and reduce water repellency ...
Adjuvant Newsletter – May 2010 - page 5
Editor in chief: Hans de Ruiter – Associate editor: Gert C. van den Berg - Publish...
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Lamberti Lamfix DCT/22 adjuvant newsletter 2010 05 may_issue


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Lamberti Lamfix DCT/22 adjuvant newsletter 2010 05 may_issue

  1. 1. Adjuvant Newsletter Development Editor in Chief: Hans de Ruiter Volume 7 – Issue 5 – May 2010 Contents: Polysaccharide based adjuvant controls drift(page 1) – China is a gold mine of generic formulation research (3) – Patents in brief (3) - Literature (2) - Agenda online (3) - Patent alert service online (5) - Advertisers (5) - Item of the month (5) POLYSACCHARIDE BASED ADJUVANT CONTROLS SPRAY DRIFT Lamberti SpA has developed a polysaccharide-based adjuvant (“Lamfix DCT/22”) which can be used to increase deposition by reducing spray drift in aerial, roadside and industrial applications. Lamfix DCT/22 works effectively with herbicides, fungicides, insecticides, desiccants and defoliants. Derived from a natural polysaccharide, Lamfix DCT/22 modifies spray particle distribution by reducing drastically the amount of fine droplets (<210 m). Lamfix DCT/22, at its recommended use rate (0.15% w/v), is able to reduce more than 75% of drifted spray droplets. A patent application on Lamfix DCT/22 as a drift control agent is pending. Contribution by Lamberti and edited by SURfaPLUS. Figure 1. Drop size distribution; West Central Research and Extension Center University of Nebraska-Lincoln (March 2010) Spray drift may result in contamination of another farmer’s crops, causing illegal residues or crop damage. In particular, herbicide spray drift can result in non-uniform application in a field, with possible crop damage and/or poor weed control. In addition, insecticide spray drift can damage beneficial insect populations, especially bees and natural predators of agricultural pests. EFFECTS OF DRIFT The effectiveness of Lamfix DCT/22 as a drift control adjuvant was analyzed with laser diffraction equipment (Figure 1). The drift control adjuvants were tank-mixed at their recommended rates with a fully-loaded glyphosate herbicide formulation (RPM = Roundup PowerMax). At an application rate of 94 L of water/ha Lamfix DCT/22 (LM22) was shown to be highly effective in reducing the number of small (driftable) spray droplets when compared to a commercial drift control adjuvant containing 30% polyacrylamide (PAM30). DROP SIZE DISTRIBUTION WIND CHAMBER TEST An additional study was conducted by Lamberti’s Central Research Department using a wind chamber to evaluate the effect of the drift control adjuvants under simulated application conditions. An axial fan pulls air through the wind chamber impacting the spray cone at velocities of approximately 4 m/s. The airflow was measured to be approximately laminar for the central 1 meter width. A single nozzle (TeeJet TP11003 VP) was placed at 60 cm of height (Figure 2). A “blank formulation” was prepared in order to simulate a fully-loaded Glyphosate formulation, but without the glyphosate active ingredient. The blank formulation contained 10% Tallow amine ethoxylate (15EO) in water, buffered to pH 4.7. Several spray solutions were prepared by mixing the blank formulation (1% v/v) with a guar- based adjuvant (0.05-0.30%), under mild stirring conditions in CIPAC D water. The adjuvants included Lamfix DCT/22 and a hydroxypropyl guar product that is currently used in many commercial drift control products (HP Guar). SOLUTIONS Continued page 2
  2. 2. Adjuvant Newsletter – May 2010 - page 2 ANALYSIS OF DRIFT A single TeeJet TP 11003 VP nozzle was used at 2 bar pressure (VMD range according to Teejet: 175-250 µm). The drifted droplets were collected by a blotting paper sheet (Figure 2). The drift effect was measured by weighing the blotting paper sheet before and after 60 seconds of spraying. The weight difference was measured within 2 minutes of the collection. All applications were replicated 3 times. The weight differences were reported as percentages and then compared to the weight difference for the blank formulation (glyphosate blank spray solution without drift control adjuvant), which was assigned a relative drift value of 100%. Lamfix DCT/22, at a use rate of 0.10 – 0.30%, reduced more than 75% of drifted droplets, which was an improvement over the HP Guar product (Figure 3) Fig. 2. Technology to measure spray drift under laboratory conditions; Lamberti Figure 3. Wind chamber results; Lamberti LAMFIX DCT/22 is a non ionic associative thickener, with typical pseudoplastic behavior also when used at low concentrations (0.15%), making it an ideal product for optimizing spray droplet deposition in agro spray applications. At higher concentrations (e.g. 1%) its rheological profile shows a high yield value and consequently good suspending properties. PRODUCT PROFILE More about Lamberti S.p.A.; see Chemical name/description: Hydrophobically modified polysaccharide. Guar gum, hydroxypropyl guars modified with groups comprising at least one C8 - C22 fatty chain. Background: Guar gum derives from the ground endosperm of the guar plant which physically resembles the soybean plant. Guar gum is a cold water soluble polysaccharide which can produce high viscosity solutions. First used in the food and textile industries, today the guar gum applications include many other industries, including paper manufacturing, personal care and agrochemicals. Uses: Well suited for applications needing high viscosity at low shear with rapid viscosity decrease when the shear increases. Used as a non ionic associative thickener and rheology control agent. Offers pseudoplastic behavior, high yield value and good suspending properties. Appearance: free flowing powder with pale cream color pH (1% soln.): 5.5 – 8.5 Brookfield viscosity (1% soln.): 4,000 – 5000 mPa·s (20O C, 20 rpm at pH 6) Solubility: Soluble in cold and warm water CAS number: 39421-75-5 TSCA: Registered EPA Approval Status: EPA 40 CFR 180.9 20 (Inert ingredients used pre-harvest) PHYSICAL-CHEMICAL PROPERTIES
  3. 3. Adjuvant Newsletter - May 2010 - page 3 Literature Enhancer of increasing pesticide products efficacy (I). Agrochemicals (2010)1 Enhancer of increasement pesticide products efficacy (II). Agrochemicals (2010)2 Research progress on applications of tea saponin in pesticides. Agrochemicals (2010)2 An approach of the normal use of pesticide adjuvant. Modern agrochemicals (2010)1 Preparation and application of emulsifier DK90# in pesticide microemulsion. Modern agrochemicals (2010)1 Problems and solutions of unsafe additive in pesticide formulation. Modern agrochemicals (2009)4 Solvent oil application at pesticide field. World pesticides (2009)6 Study on the stability of liquid pesticide aqueous emulsion. World pesticides (2009)6 Application of organosilicon defoamer in pesticide formulation. Pesticide science and administration (2010)1 Continued page 4 TREND China is a gold mine of generic formulation research Unknown, unloved. Only few know the way to the Chinese mine of information on adjuvants and generic formulations. Adjuvant Newsletter brings you to the yield of adjuvant and formulation related agrochemistry research in China. How does a methyl esterified cottonseed oil emulsion perform as herbicide adjuvant? Formulators from Shandong Huayang Technology know. They too know how to prepare this novel adjuvant. The results of their investigations however are only published in a Chinese-language journal. Who has no Chinese, has to rely on an abstract. This methyl esterified cottonseed oil emulsion story is not isolated. Many other Chinese researchers publish as well their findings exclusively in Chinese-language journals. In this way the large yield of applied and basic research on formulation of (generic) pesticides nearly remain unnoticed by interested parties outside China. A quick scan conducted by Adjuvant Newsletter demonstrates the area of adjuvant and formulation research that has been published the last months in Chinese- language papers (see Literature on pp 3-4). A lot of papers deal with generic insecticides. In the past months, papers about adjuvants and fungicidal and herbicidal formulations have been published. PATENTS IN BRIEF Doubled pesticide effectiveness claimed Specialty Fertilizer Products claims with its itaconic/maleic copolymer adjuvants a “two-fold greater pesticidal effectiveness, as compared with an equal amount of the pesticide without the copolymer”. According to the American fertiliser company, this copolymer blend contrasts with other “expedients” that are “known to marginally increase pesticide performance”. In an recently granted US patent (US7655597) inventor John Larry Sanders says these expedients in general “do not provide significant, multiple-fold increases in pesticidal effectiveness”. Specialty Fertilizer Products illustrates the increased effectiveness with a fire ant control test. In this test various dilution levels of the insecticides bifenthrin, permethrin or malathion are used, whether or not supplied with the Avail copolymer fertiliser additive. In all cases the copolymer materially lowers the kill time of the ants. “Although the mechanism of this effect is not fully understood, it is believed that the tested insecticides, having an amphoteric or positive charge, are modified by the copolymer to change the membrane potential thereof, e.g., the copolymer aggregates the charge, rendering the insecticide/copolymer mixture more effective. This is confirmed by a series of tests with a negatively charged insecticide (Diazinon® ) where the copolymer gave no decrease in kill times as compared with the insecticide itself”. The itaconic/maleic copolymer-based fertiliser additive Nutrisphere for liquids (also from Specialty Fertilizer Products) improves the efficacy of a glyphosate composition comprising urea and ammonium nitrate. According to a presentation given by John Larry Sanders, this nitrogen protecting fertiliser additive pulls the nickel out of the urease molecule. Specialty Fertilizer Products doesn’t explain the mode of action of the copolymer in the glyphosate plus nitrogen fertiliser composition. Fire ant war continues; University of Florida Pesticide Information Office GENERAL
  4. 4. Adjuvant Newsletter - May 2010 - page 4 Surfactants increase uniformity of soil water content and reduce water repellency on sand-based golf putting greens. Soil science 175(2010)3: 111-117 Aqueous solution of anionic surfactants mixed with soils show a synergistic reduction in surface tension. Water, air, & soil pollution 209(2010)1-4: 3-13 SOIL/GROWING MEDIUM Mechanism of PEO–PPO–PEO micellization in aqueous solutions studied by two-dimensional correlation FTIR spectroscopy J Colloid Interface Sci 345(2010)2: 332-337 The clouding behaviour of PEO–PPO based triblock copolymers in aqueous ionic surfactant solutions: A new approach for cloud point measurements J Colloid Interface Sci 345(2010)2: 346-350 CHEMISTRY Aqueous coating dispersion (pseudolatex) of zein improves formulation of sustained-release tablets containing very water- soluble drug J Colloid Interface Sci 345(2010)1: 46-53 FORMULATION Effect of biodegradable chelating ligand on iron bioavailability and radish growth. Journal of plant nutrition 33(2010)6: 933- 942 Promoting fertilizer use via controlled release of a bacteria-encapsulated film bag J Agric Food Chem 58(2010)10: 6300– 6305 Effect of particle size on copper oxychloride transport through saturated sand columns J Agric Food Chem 58(2010)11: 6870–6875 FERTILISERS Formulation of permethrin·a-(L)-terpineol 15% EW. Agrochemicals (2010)2 Preparation of chlorpyrifos microcapsule and its long biotoxicity. Modern agrochemicals (2009)4 Microcapsulating and control efficacy of chlorpyrifos·betacypermethrin on grubs (Anomala corpulenta). Chinese journal of pesticide science (2009)4 Research the formulation of chlorpyrifos microemulsion. Agrochemicals (2010)2 Determined the controlled release of the encapsulated granule of the sex pheromone of Grapholitha molesta Busck by gas chromatograph. Agrochemicals (2010)2 Application prospects of microencapsulation pesticides in management of underground pests. Modern agrochemicals (2009)5 Preparation of abamectin microemulsion using organosilicon co-formulant. Chinese journal of pesticide science (2009)4 Preparation of emamectin-benzoate microcapsules by complex coacervation. Chinese journal of pesticide science (2009)4 Preparation of emamectin benzoate 5% WG. Pesticide science and administration (2010)3 Progress and formulation of pyrethroid pesticides. World pesticides (2009)5 INSECTICIDES Bases for interactions between saflufenacil and glyphosate in plants J. Agric Food Chem 58(2010)12: 7335–7343 Study on enhancement of wetting property of herbicide on Eupatorium adenophorum Spreng leaves by petroleum oil. Modern agrochemicals (2009)6 Research on the prescription of water dispersible granules of 800 g/kg tebuthiuron. Modern agrochemicals (2010)1 Formulation study of 14% bensulfuron-methyl and acetochlor effervescent granules scattered. Modern agrochemicals (2009)5 Controlled release of herbicide from cellulose and its composite gels. Modern agrochemicals (2009)4 Performance of slow-release formulations of alachlor. Soil Science Society of America journal 74(2010)3: 898-905 HERBICIDES Preparation of pyrimethanil·difenoconazole 40% SC. Pesticide science and administration (2010)2 Toxicity of the mixtures of octadecyl trimethyl ammonium chloride and isoprothiolane on Magnaporthe grisea. Pesticide science and administration (2010)2 FUNGICIDES Study on the formulation of pymetrozine 70% WG. Pesticide science and administration (2010)2 ANTI-FEEDENT
  5. 5. Adjuvant Newsletter – May 2010 - page 5 Editor in chief: Hans de Ruiter – Associate editor: Gert C. van den Berg - Publisher: SURfaPLUS Internet Services, Costerweg 5, 6702 AA Wageningen, The Netherlands. Phone +31 317451235;website – Subscription online : 110 euro/year 1-10 internal readers, 330 euro/year unlimited internally – Adjuvant Newsletter is a monthly digital newsletter on Adjuvants and Formulations Colophon Advertising companies Patents online By clicking on patents, you will be connected to the SURfaPLUS Patent Alert Service. Information on patents dealing with adjuvants and formulations. Agenda online The agenda includes international and national meetings whereby attention is paid to formulations and adjuvants. In case readers want to insert information about important meetings, please contact us. Your customers and relations are subscribers to the Adjuvant Newsleter and visit You are welcome to join the other advertisers online. The advertisement also includes a notation in the newsletter. You may complete an order form or contact us. Full advertisement online Full advertisement online Full advertisement online /agricultural.asp Full advertisement online Item of the month usinesses/AgroSolutions Full advertisement online YOUR AD MAY COME HERE AND ON WWW.SURFAPLUS.COM This column is reserved for an item that attracks our or your attention. A particular innovation or unusual news. In case you have an item, send it by e-mail. INTERACTIONS BETWEEN SAFLUFENACIL AND GLYPHOSATE Christopher Hall and colleagues found an interaction between glyphosate and saflufenacil regarding absorption and translocation. They used buckwheat (Fagropyrum esculentum Moench.), cabbage (Brassica oleracea L), and conventional and glyphosate-resistant varieties of canola (Brassica napus L.). Increased absorption of saflufenacil by the addition of Transorb (i.e., Transorb formulation with glyphosate) plus Merge appears to increase its contact activity. However, saflufenacil activity reduced glyphosate activity, possibly by reducing translocation. More online.