REPORT OF STATE HORTICULTURIST. 55 



infested trees were ordered burned at once and a careful watch 

 will be kept on the fruit trees in that vicinity. 



This infestation would seem to indicate that the fruit inter- 

 ests of the state were seriously threatened by this destructive 

 pest, for there are several localities in the state where trees 

 have been killed by this dreaded scale. A careful review of the 

 cases which have come to the observation of this Bureau shows 

 that all orchardists and nurserymen must be on the alert for 

 the appearance of this apparently insignificant little insect. 



However, there is an encouraging factor which needs to be 

 brought to the attention of fruit men. So far as can be de- 

 termined, all infestations of San Jose scale have developed 

 from stock carrying the scale at the time it was shipped from 

 the nursery. 



In no instance where serious cases have been noted do we find 

 that consecutive trees in a row are the ones that are affected. 

 Invariably, the dead or dying trees are found scattered over an 

 area represented by a setting of trees from some one particu- 

 lar shipment of stock. At Cornish, in the orchard of Roscoe 

 Pease, two apple trees were reported as infested with scale, by 

 gypsy moth scouts in 1908. This orchard was not visited by a 

 representative of this Bureau until the summer of 1913. A 

 careful inspection was then made and scale could be found on 

 only three trees in the entire orchard. These trees set fifteen 

 years ago were dying from the effects of the scale infestation, 

 but no other trees carried even scattering individuals, as far as 

 could be determined. The conclusion to be drawn is that these 

 trees were affected when they left the nursery and that condi- 

 tions were not favorable for the spreading of this trouble to 

 trees not infested when they left the nursery. Other infesta- 

 tions, such as the one in the large plum orchard of George 

 Wiseman, Lewiston, bear out these conclusions. There is 

 every evidence that the scale is not spreading to trees that ad- 

 join, but is developing on those trees which may have been 

 infested when they left the nursery. 



Seriously affected trees should be cut and burned, for there 

 is little hope of making vigorous specimens from trees so handi- 

 capped, as are many of those which have come to our attention. 



Temperature ranges seem to have some effect on the way 

 the scale increases. While it is known that in the southern 



