Show round 0 FIND APPLE SCAB CAUSE OF INJURY big secret Is to keep exposed parts protected apple scab b continues to be one of the chief 1 1 causes of loss to apple appl glowers this disease and the fun kus which id 18 the primary cause are being critically studied d by dr G W keitt ar and d his associates in the department part ment of plant pathology of the the wisconsin wisconsin college of agriculture experiments peri perl ments ments ore are being conducted ted mi n ma madison both in the orchard n and nd greenhouse arld and at the branch station at sturgeon bay where a laboratory is Is maintained during the the growing a and nd harvesting season it has been found that the itie fungus commences commena es to discharge ll spores into tile the air from dead apples leaves on n the ground ve very ry early in the cpr spring ing the conditions favoring spore discharge and etly early infection are frequent rains and comparatively low temperature I 1 apple abud development Is herslow ver slow at those these low temperatures tempera turea but the green tips of the sepals pals and leaves start between the forced open bud scales and provide tin nn opportunity for the early discharged scab spores to find a place to grow lime sulphur with lead arsenate senate ja 1 50 has given the best control of scab peat especially when applied before a rain if impossible to get spray applied before a rain much 6 benefit may be secured if an application Is made as soon as the leaves are dryl dry following a rain several other sprays have given good control of scab when applied before n rain but were less efficient applied following it r rain aln scab spores are discharged duran during and after a rain while the I 1 leaves are wet this accounts acco unta fordythe fur the great abundance of seat scab infection during ur t the he wet spring of 1027 1927 the first spray should be applied when ahe dey developing eloping sepals and leaf buds show green tips A second spray should be put on the bloss blossom fM buds are jn in the closed cluster condition before the appearance of pink tolor color after this the regular schedule may be foli followed owed the whole secret of success I 1 in n apple scab control is IP to keep the exposed parts protected from fungus invasion during their young youn gand and susceptible condition this Is especially bruein true in wet seasons |