Show SPRAYING POTATOES TO CONTROL BLIGHT experiments prove that bordeaux mixture Is eff effective active results given of tests conducted last year in aroostook Aroos took county maine by the department of agriculture prepared by the united states department of agriculture that thorough spraying will control late blight in seasons of bad infection has been proven many times in the he past and most recently in tests conducted last year tit in county maine by the united states department of agriculture in cooper co oper aaion with the maine experiment peri ment station atlon et some potato growers have expressed their opinion that it does docs not pay to sarpy potatoes for this disease growers grow era of this opinion claim that when the weather conditions are arc such that the he blight Is severe spraying does not control it bedl clentry to give an appreciable increase in III tho the yield and that in III sell seasons sOns when tho ilia attack Is light the increase in the ilia yield from spraying Is not sufficient to cover the added cost in ono one block where here small email test plots sprayed with standard bordeaux bor denux mixture were interspersed persed with untreated check plots tho the average yield on 11 of tho the coriner was at the rate of 1812 bushels per lier aero acre while that on wn an equal number of untreated plots was nt at tile rate of 1435 bushels per ocre acre tills this was nil an increase of bushel 1 per acre or moro more than 20 per cent in III favor of bordeaux bord caux mixture in another slin similar liar block tho the overage average yield of five plots sprayed with bordeaux mixture waa nt at the rate ol 01 0 nearly bushels par acre while hat flint of tile tho four untreated chock check plots in III the panic block was 1713 1743 17 13 bushels the ile gain liere here wits was bushels per acre or about SO 30 per cent duo due to spraying six applications were boado on all tile the abovementioned above ment mentioned boned sprayed plots on these experimental plots spraying ought to have been started ten days or two weeks sooner or by tile the end em of the first week in july in spite of this fact tho the yields given above trull rate cate alto plainly that spraying paid moreover many persons persona who saw the plots lots duriez durans the latter part of the teason have anve testified to the striking differences feren ces on sprayed and uius unsprayed prayed portions on all the treated plots the spraying was wa s done with a traction sprayer which maintained a good working pressure of at leaba poian ands ds per square inch adjoining one of tile tho experimental blocks ill was I 1 field where spraying wits was begun earlier and eight or nine were made it woo pla plaisted plaintel plain inteL ted with tile the same lot of the some same vp variety biety of seed fertilized the same and except for spraying received similar sivillar treatment in every respect the yield on the portion of this field lately adjoining one of tho the unsprayed kyed check plots was 2073 bushels per mere comparing tills this with the averages averna s of the unsprayed check plots mentioned above shows a gain of 1238 and anal 03 bushels per acre respectively or over niver SO 80 and 63 per cent in none of 0 tile the above figures Is tiny any account made mad a of oc the extra loss resulting from tuber rot in storage in tile crop produced on the unsprayed plots nineteen hundred and was ono one of the worst blight yanis in III ilia history story lil of AToo potato gir growing ow tho the results cited above show conclusively that even under the conditions that hat existed late might blight cna can be controlled by a brower grower who bets out oitt to do 10 tile job thoroughly moreover they indicate licato that it can bo be done mit at a fair profit when the cost Is considered in connection with the value of the increased increase yield resulting from tho he treatment these recommendations apply apar to the potato sections eting north of a line drawn from now york to ChIc chicago |