. The commercial apple industry of North America. muchshorter lived than the eastern plantation. Trees thatattain maturity at such an early age under artificial condi-tions cannot continue to maintain vegetative vigor andhealth indefinitely. As yet it cannot be said just whatthe life of an irrigated orchard under good managementmay be, but from present indications it would seem thatthirty years would about mark the life of the average irri-gated orchard. It is certain that trees are ordinarily mostprofitable and at their best under irrigated conditionsbetween the ages of ten and twenty years.
. The commercial apple industry of North America. muchshorter lived than the eastern plantation. Trees thatattain maturity at such an early age under artificial condi-tions cannot continue to maintain vegetative vigor andhealth indefinitely. As yet it cannot be said just whatthe life of an irrigated orchard under good managementmay be, but from present indications it would seem thatthirty years would about mark the life of the average irri-gated orchard. It is certain that trees are ordinarily mostprofitable and at their best under irrigated conditionsbetween the ages of ten and twenty years. 6. Irrigated regions are usually free from fungus. Se-rious trouble only appears in the semi-irrigated regions likeHood River Valley where the rainfall is as great as that inwestern New York, but where orchards generally are underirrigation, due to the rainfall coming at the VTrong seasonof the year. There is little fimgus difficulty in thefamous Yakima and Wenatchee valleys of Washington orin the irrigated districts of Idaho, Colorado, Utah and. Irrigation 175 New Mexico. In this connection, however, it might bewell to say that the codlin-moth is generally very muchmore active and difficult to control than under eastern con-ditions and particularly has this been true of late years. 7. Trees in irrigated regions require detailed care everyyear. A grower in an irrigated district must pay strictattention to his orchard if it is to survive or he is tosecure any profit out of it. It is absolutely necessary thatit be irrigated and if this highly important operation isneglected for a single season, the orchard is ruined. Fur-thermore, if the irrigating is left to inexperienced hands,the trees are likely to be over-irrigated or under-irrigatedto such an extent that they will be injured care also is necessary to see that the water is notallowed to stand on the land or applied at the wrong eastern conditions, none of these things is necessary,so that orchard
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