Arizona republican., 1891-08-18
THE CONDITIONS ARE DIFFERENT.
Climatic and Soil Conditions Influencs
 Matter.

Climatic and Soil Conditions Influence
 Matter.
 The Marysville, Cal, Appeal says: "Peach trees can scarcely be planted in California fast enough to to make up for the large number destroyed in the East by the disease known as the yellows, MHNy thousands of acres of peach or ,.lards on the Atlantic coast have been ruined of late years by the scourge And as yet nothing has been found to itsrav. ages, and even it's orign is not known. Care should be taken to prevent the in- troduction of this malady in California through importntions of nursery stock from Eastern localities infested with the yellows.
 It is well to be careful There is also danger of being too careful thereby caus- ing unnecessary trouble and expense. Eellows of the peach tree is fearful scourge in climates and soils suited to it's development and spread. So is pear tree blight, the plum curculio, the yellow fever, malaria and the swamp fever of the Southern states, etc., etc. All these seem to be strictly local and dependent on climatic conditions or soil influences.
 The dreaded pear tree blight, which destroys the pear, apple and quince trees on the Atlantic slope.-was introduced out here years ago in nulaerous in stances. Yet after many years it has gained no headway in our orchards and So far has done no material injury. There is scarcely an old pear or apple orchard on the whole coast but what genuine Eastern pear blight can be plainly seen involving every tree. And 1t can alse be plainly seen that it does the trees no material injury. Why? Simply because the climate prevents its spread through the cellular system of the tree. The reasons therefor are not cas- lily explained, yet the the fact remains that 1t does not spread sufficiently to do injury. All such things are bound up in the iron bands of natural laws, from which the cannot escape. The red clover plant has been introduced here thousands of times and has often disap- peared and throughout nearly every square mile of the whole coast it can only be Eept alive by constant care.
 The same Is true of the Kentucky blue grasses, the two most persistent and ubiquitous plants of the middle states. Yet do as We may, here in the same lat. itude, they disappear if left to nature. And they disappear as natural wild bland on the south line of Tennessee, on the same class of soils that they flourish 50 grandly on only few scarcee miles further north.
 These tree diseases such as peach vel lows, pear blight, apple and pear scab, grape mildew, etc., are simply parasitic plants subject to the same natural laws by which other plants are governed. But luckily for us their limits and range of natural propagation, and ranges of soil and climate suited to their spread is very much more limited and confined than most higher orders of plants. We may consider it as settled fact that this coast has now every injurious plant and insect pest that have been any length of time in the Eastern states that can sustain themselves here. About the only injurious things among plants and insects we need now to fear by importa tions are those natural to other climates and without cold winters similar to ours. Such fruits as the olive, the orange fam lily, the date and other fruits from dry hot summer climates are about the only ones for which we need fear new nat ural enemies. It is true that some fruits have insect enemies and diseases in some countries of peculiar summer climates that have driven them entirely out of cultivation where they at one time four ished. Thus a small fly has obliterated peach culture on many of the West h. dia islands. Yet it has not reached our coast only few hundred miles away. At least it has not spread here although it must have been often imported. Again the peach is rendered almost worthless in Japan by what may be termed the codling moth of the peach. This insect if introduced here might ruin our entire peach interest, provided we could not control it.
 We need no more fear the peach yell lows nor the plum curculio than the blizzards of Dakota. The best theory on peach yellows is that it develops from fault of both soil and climate East it is vlrulent only in soils of low altitude that lacking in potash and it's salts. On this coast we have an entirely different summer climate with a superabundance of potash and alkal in our soils.
 D. B. WIRE.