. Luther Burbank: his methods and discoveries and their practical application. Prepared from his original field notes covering more than 100,000 experiments made during forty years devoted to plant improvement, with the assistance of the Luther Burbank Society and its entire membership, under the editorial direction of John Whitson and Robert John and Henry Smith Williams. st climates. Thispest is relatively harmless to the treetops, but doesgreat damage when it infests the roots of a tree. Because of the immunity of the pear to the at-tacks of the woolly aphis, I have made many at-tempts to f
. Luther Burbank: his methods and discoveries and their practical application. Prepared from his original field notes covering more than 100,000 experiments made during forty years devoted to plant improvement, with the assistance of the Luther Burbank Society and its entire membership, under the editorial direction of John Whitson and Robert John and Henry Smith Williams. st climates. Thispest is relatively harmless to the treetops, but doesgreat damage when it infests the roots of a tree. Because of the immunity of the pear to the at-tacks of the woolly aphis, I have made many at-tempts to find a variety of pear that would serveas stocks on which to graft apples. In a very fewcases the grafts have taken well at first, but thefinal result was a failure, from a commercialstandpoint. It is possible that a variety of pearwill eventually be found which will be congenialto the various varieties of apples; and, if so, theproblem of combatting the woolly aphis will havebeen solved. My experiments consisted in growing seedlingpears to get new varieties on which to graft theapples. This is probably the only way to approachthe subject, for attempts have been made withpractically all the existing varieties of pears, andin every case the result has been failure. Fortunately there is one well-known variety ofapple, the Northern Spy, that is aphis-proof. Trees [198]. • 3 •* a. -1 3«^ - S ** :; » 2 tea ic a ,^ ^ ?« a £ i- ?o •«« *= e •^ ~- u a2 2 ?^ C M f» a ~ — o::? ^ ^ o a ? 5. a-^ a•» J* 2 ft • *^ fA n 7 <» «• LUTHER BURBANK of this variety are never injured by these insects,even when planted beside trees seriously has been found expedient, therefore, to graftother varieties on roots of the Northern Spy, andan orchard that has practical immunity to the at-tacks of the aphis may thus be produced. Unfortunately the seedlings of the NorthernSpy do not generally inherit this quality of resist-ance to the aphis, so it is necessary to grow th
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