Show spraying for potato blight and rot ro success dependent upon the fungicide used by james G millvard Milt vard firs first chit hit h it is bwy e ariy blight ne term blight hi iti often evy cry broadly used potato growers even to the e of or any ator early withering j li the vines blight birly r arly blight proper Is caused by 1 i ceina parasitic fungus bolani it sedora stacks the healthy inc directly but gains entrance after the lne ine haa has become ined by injury hance its awing du ang season seasons of or serl nerious it iniste mint front thu beetles the apa bearance pe a arance tit jf yellow leaves nud and dark lark circular spot upon the foliage indicate the etric presence of the dis ease unde favorable favor favo ible conditions appearance pe arance may develop to tho th scent ement di 61 giving the entire held it speckled spec klod and blAc blackened bened ippe appearance arance the turn yellow ellow grow spindly and an ripen prematurely beveral days in advance of tha the season sea ion during o 0 u st labona for furgus development th the chenie may way exist unobserved during luring the I 1 inlow t lod ot hobt at autive live growth and later multiply multi pl rapidly at the expense ep ense I 1 firming tub tatt 4 A microscopic micro mic C examination ei at thia this will show the i debence ife bence of thousand thousands ot of caul shape sh apal I 1 coA ldla in lit the tissues of the plant ohp th nanie far earli elight Is I 1 bemuse u its effects vary mry be moy molt uoti noticeable ceable during the n months of 0 august and it must bo be remembered a so that te fun dungu gut does not attack the tubera direct directly Jyl but the yield results in nn an Infer erlof loi grade ut of potatoes with a high percentage of culls quite in contrast to caily blight late IH Is cau caused ed by nn active virulent parasitic alinus luora Infest ans the disease Is a native ut f the wild potato vine ot of south america and aas introduced into europe early in the nineteenth century IL 1813 1815 it slept oer mer gormany and anti the gritl h 11 aa an epidemic cauilan cuu practically the u lobs of the en tire crop duo due to its econome cco nomi importance in lit these co rles the life histon hirton f the fungus as far as it 14 1 4 now known waa entirely worried out by Ger gennen inez and english horticulturists and the tiU cst advance toward the control ol 01 tho the ilse axe ha hat been nde mode in this country in tit recent years tue in part to tho the pro luction ot 01 effi efficient elent spraying mit chinery sul table for large la plantations moist foist warm we it her during the months of 0 and september it I 1 espe lilly Imo nible for the development or OF late blight figgin under condition iti lit two days time the may turn an apparently healthy held field aito A i mal of pu pit tri lipil and blackened binck eneil inea indal unfortunate Ilea tute u of the diasy dis ilg li it that it t not only destroys the N inca tiles but the suni may inay gain e entrance A to the tubers and vause 1 da mite from rot the batting of potatoes in storage vili vilich lh Is au very gen trally attributed to the lute we beighl funair ie Is vt v ry likely due thie to bacterial calibe u L the relative importance ol 01 the f airl tri and late blight fungus tc the 1 potato twi industry is lot definitely determined the loss frum from early blight Is I 1 more inore teady steady and it if Is probable the 11 doe more 01 lega 1 1 I 1 mage esely late blight apap mon more periodically but when it la it elisca c inore more sier lons 1 dame to the yield I 1 ii it success ot of any iris ing future depends tends de upon tha tri of the selected IcIde lu ill the disease ease and upon the actual increase in profit which can bf rea lizett aboa the ott of treatment I 1 in new york aa Se eral 1 grower grow erit ire are with he the ex j peri perl nt station to determine the I 1 pro under actual form forni A of that work fur for esti estl 1 sq the cost enit of application al 94 90 u nth per acre they obtained un an aei ao itce Inere aae of 51 bue licis pel pet dd ice which netted nn an I 1 of 1 per acre later 1 rep oril indicate ihnat 1 hat han badt rapid progress in hit state and Is 14 becoming quite tite pro egeln grower 4 |