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190 7’H-IR N IJRSER Y-M,4 N Ti.4 I,long, twenty feet wide and tell feet high in the clear, will winterabout flt,,O()() three-year-ol(l apple trees, if the trees are corded,as already described.While vtntilution should be provided, the house may neverthelessbe kept c4ose in cold weather. If the temperature runsbut little above frecbzillg, there is little withering nor does moldde\velop. SOW houstls art‘ provided with refrigeration. Keepinghouses too warm and allowing air to blow through arelikely to de&dim the stock.IMPORTANT DISEASES AND INSECTS AFFECTING NURSERY STOCKPrepared for tllis 3lanual by the late V. 13. Stewart, Bureau of PlantIndu~tr~~, United States L)epzirtment of Agriculture, and of Cornell Univers1tI \ , qxvialist ill nursery-t;tock diseases. Fumigation and inspection,not dealing with the growing and perfecting of the stock, are not treatedhere. (;rowm ivill (10 \\ell to rons1llt s11rli worlds as 14:. I?. Smith 0tI“l!acteriul I)iwaw: of PlalltS” (Sanders, Phila.), awl t-lie Rural Manuals 1)~lle5ler 8c 1Vlietzt4, l&nkiu, Slingerinncl & (‘roJq~.The ilnpn~ti~nt problem coufronti1q uurseryrnen is theproductiorl r~f tht. grwtt~st C]UillltitJr of first-class stock to theacre within thtl shortest period of tim. Sm4~ ~~onditio~~s asWWtht!r, soil, cultiv&m, a~ltl presetm of certain destrucstivediseases, are some of the factors that influence the developmentof nurWqY plantings. Of particular importance is theeffect of y;triolls I)lullt (liseases and ins&s. The stock mayhave deveh)prtl j.tqr rapidI>’ illltl bca perfectly healthy, whwwithin a I’qV sllort time c~oll(litions Illil) (‘lliLll@ ;l,lltl the plantsbecome seriously injured or totirll>. milled I)>. a destructivedisease or il lsect .The losst5 ill tlltl Ilursery C!iluSet~ 11)~ diseases are often veqhC%V)‘. Some (liseilsfr’s, swll ilS fire-blight, completely de&o)the stock attaclcecl urhss the disease is t~radicat,ed by cuttingout, the affec,ted parts. Otht~r diseases iifFWt 0111)~ the foliagead art: a m011acc to nursery stock by causing the leaves to