Boll weevils

While solid m.p. 95 -96 - C, soluble in organic solvents. An insecticide similar to chlordane. Used to control cotton boll weevil. 

Grandisol, with a four-membered ring, is another insect hormone, the male sex hormone of the boll weevil to be precise. It may also be useful as a highly specific pest control. How might it be made ... 

Boiler yater treatment Boiling point elevation Bois de Rose oil Bois de rose oil Boll weevil Bollworm Bologna Bolometer Bolometers... 

In 1963, Keller and coworkers (45) and Neff and Vanderzant (52) reported the presence of a boll weevil attractant in cotton squares and seedlings. In the same year, an arrestant (a substance... 

Although the boll weevil, a very serious cotton pest in the South, feeds voraciously on cotton squares and bolls in response to an at-tractant or attractants contained therein, these same cotton parts (49) contain also a boll weevil repellent that shows its effect once the at-tractant has volatilized completely. Department of Agriculture scientists are attempting to isolate and identify this repellent, which presumably could be applied to ward off weevil attack. Cotton seedlings painted with an aqueous emulsion of the material effectively repelled 100% of the weevils for 5 hours and only medium damage was evident after 12 hours, whereas control seedlings were completely destroyed after only 2 hours. 

Ketone (27) was needed for a synthesis of the boll weevil pheromone (28), Suggest a synthesis of (27) using Birch reduct ion,... 

Center for Alluvial Plains Studies, Delta State University, Cleveland, MS 38733 Boll Weevil Research Laboratory, Midsouth Area, U.S. Department of Agriculture, Agricultural Research Service, Mississippi State, MS 39762-5367... 

DDT at 10 pounds per acre to control the bollworm, boll weevil, cotton fleahopper, tarnished plant bug, rapid plant bug, and some species of cutworms and thrips. (On cotton just up it was found that only 0.07 pound per acre of aldrin, applied as an emulsion, was necessary for the control of cutworms and thrips.) Significantly, no increase in aphid population was noted following the use of the aldrin-DDT mixture (4). 

In the middle of the 1980s in the USSR, approximately 150 species acquired resistance to one of the various OCPs and OPPs used [3], and now require more complicated means of suppression. For example, until the 1950s, weevils and boll weevils were the main pests damaging cotton. After the widespread use of OCP insecticides - DDT, toxafene, and others - cottonworms, tobacco tortricids, tobacco aphids, spider mites and loopers must now be fought as well. Their number jumped after suppression of the first two target species. 

Scheme 54 summarizes Font s synthesis of (+)-grandisol (36), the male pheromone of the cotton boll weevil (Anthonomus grandis) [80]. The key-step is the double [2+2] photocycloaddition of ethylene to bis(a,(3-butenohde) A to give B, which yielded C after glycol cleavage. The recently identified pheromone of the oleander scale (Aspidiotus nerii) possesses a structure similar to that of grandisol (Scheme 54), and its synthesis was reported by Ducrot [81 ] and also by Guerrero [82,83]. 

Bull, D.L. 1980. Fate of diflubenzuron after application to cotton and the boll weevil. Southwest. Entomol., Suppl. 1 2-7. 

The haloform analogue of the above cleavage may also be employed to solve such problems of geminal alkylation. Scheme 3 outlines this approach to grandisol (140), a constituent of the sex pheromone of the boll weevil 74,134). To minimize problems... 

The number one cotton pest in the United States, the boll weevil (Anthonomus grandis Boh.), occurs in Mexico, Costa Rica, Nicaragua, Colombia, and Venezuela and is probably also the number one pest in these countries. 

The pheromone bouquet of the pecan weevil, Curculio caryae is similar to that of the boll weevil however, it also contains (lS,2JR)-grandisol. The quantitative composition of the blend determines whether it is more attractive to the pecan weevil or to the boll weevil [386]. In some pine weevils, Pissodes species, grandisol and the corresponding aldehyde, grandisal, are components of a male produced pheromone. In Pissodes nemorensis and Pissodes strobi grandisol... 

Diflubenzuron (Dimilin , TH-6040) is an IGR which inhibits the normal deposition of chitin. The metabolic fate of diflubenzuron has been studied in sheep U, 2), cattle (1 ), rats (1, 3), house flies (4, 5), stable flies (5), chickens (6), swine (6), boll weevils (7), plants (8 9), and soil (2, 8, 10). Since good reviews of diflubenzuron metabolism have been given by Ivie (11) and Verloop and Ferrell (9), we will present only a tabular summary of the degradation of diflubenzuron in nonaguatic systems for comparative purposes (Table I). The remaining discussion will focus on diflubenzuron degradation in the aquatic environment. 

Joiner, R.L., Chambers, H.W., and Baetcke, K.P. Toxicity of parathion and several of its photoalteration products to boll weevils. Bull. Environ. Contam. Toxicol, 6(3) 220-224, 1971. 

Most of the compounds of arsenic are toxic when in contact with the skin, when inhaled, or when ingested. As with arsenics cousin phosphorus above it in group 15 of the periodic table, care must be taken when using arsenic. The compound arsenic trioxide (As O ), an excellent weed-killer, is also carcinogenic. Copper acetoarsenite, known as Paris green, is used to spray cotton for boll weevils. A poisonous dose of arsenic as small as 60 miUigrams can be detected within the body by using the Marsh test. 

Uses. Insecticide for boll weevil control and termite control currently banned or severely restricted in many countries... 

The boll weevil sex attractant is a mixture of four compounds, two alcohols and two aldehydes. 

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