Pine Bluff daily graphic., 1920-06-13
BOIL WEEVIL THIS YEAR WILL bE WORSE
 THAN EVER, BELIEF
How Best to Combat the Pest Is Related by Fix
 pert
By L. c MOSER.

are lidC llie lHllldl DUH WecNll H. r fcstation this year will be, generally | speaking, heavier than it has been | before or since 1916. In some places where the leaf worm operates late. comparatively few weevils went in- to Information. For that reason, | somewhat Spotted" infestation is ex- pected. In the greater part of the Y weevil territory, however, the rav- ages of the leaf worm came compara- | lively early and the weevils increased | sufficiently to send large crop in to hibernation. With anything short | ideal cotton weather conditions. the southern half of the gulf states may be expected to suffer severely. |
 If you are going to poison the bell | wetvil to save your cotton crop, do not put tco much dependence upon the hand gun duster It is an ef- fective limit up to certain limit, but it's use is certain to result in failure if an attempt is made to cov- CT an acreage of much more than 25 acres, declare the specialists of the United States department of agricul- ture who worked out the calcium ar senate system of controlling the boil weevil, and who have experienced with the hand gun for many years
 Don't Attempt Impossible.
 With a good man cranking the hand gun, one acre of cotton can be covered in one hour. But he cannot be expected to cover 10 acres of cotton in 10 hcurs-no more than Dan Patch could have expected to pace 10 miles in 20 minutes because he could pace one mile in less than two minutes. A great many plant CTS have ried to handle large \ acreages with hand power machines and it is the observation of the spe- cialists that without exception when 1 the acreages exceeded 50 acres, the program "blew up" before the sea- son was over.
 The effect of poisoning the boil weevil is cumulative. If the weevi!s are not kept under control until q crop of bolls is "set", all the effort and money involved in the work is lost. The average farmer plants dUSuG 4U CI OU acres OI COUUOn-UOO much to be handled with hand guns ard not enough, ordinarily, to justi- fly the purchase of car duster Should the planter let the weevils cat up his crop without an effort at poisoning? No. If you are one of the farmers who plant 30, 40, 50 or 60 acres of cotton, select the best yielding, most heavily infested land and treat that only. Let the thin lands and the areas that are not heav- fly infested go imprisoned.
 Four-Day Interval Best.
 Results of all experiments made indicate the proper system of pos- oning is to let the weevils multiply until they are puncturing 12 or 15 per cent of the squares. The first application of calcium arsenate should then be made using from five to eight pounds to the acre. The larger amount is safer. This will be effective against the adult weevils, but it will not effect the immature forms then in the squares and bolls. Nearly as many weevils will emerge the next day as were killed on the day the poison was applied, and so on for about two weeks.
 The poison remains effective for only few days. By the fourth day. so much of it has shaken or washed off and so much new plant growth has appeared, that the merging wee wills are no longer killed. On the fourth day, therefore a second ap- plication with the same quantity of poison is needed. The poisoning should be continued at four-day in- tervals until the weevils are reduced below the point of danger. Poison ings may then be discontinued and the weevils allowed to multiply. With the four-day intervals it is possible almost to wipe the weevils out. With longer interval, the weevils that emerge between applications will be- l gin laying and perretuate themselves. The shorter interval increases the machinery investment, but it decreas- es the number of applications and l therefore reduces the labor cost and the cost of materials. And it makes possible much more thorough control.
 Right Kind of Poison.
 Another point to which the farm CT should give special attention is, get the right kind of calcium arsen- ate. The fact that the material is calcium arsenate is not sufficient. | It must be the kind of calcium ar senate that will kill boil weevils, will not kill cotton and can be handled successfully in dusting machine. It | should contain not less than 40 per cent arsenate pentoxide If it con tains less than that, it will not kill weevils It should contain not more l than three-fourths of one per cent water soluble arsenate pentoXide.