REPORT OF THE DIVISION OF PLANT PEST 



CONTROL. 



Inspection Work, 



The inspection of the nurseries, and the white pine blister rust 

 and European corn borer work have been conducted along the 

 lines pursued last year. 



The interstate shipments of nursery stock began about the 

 middle of March, and an unusually large number of these were 

 inspected at their destination. Most of them were in good con- 

 dition, free from infestation, and of good quality stock, but a 

 few were rather badly infested with oyster-shell scale. These 

 infested shipments were destroyed with one exception, in which 

 case the stock was returned to the consignor. 



The Federal Horticultural Board restricts the importation of 

 nursery stock from foreign countries except under special per- 

 mit. For this reason very few shipments are brought in. How- 

 ever, last spring a brown-tail nest was found on a shipment of 

 fruit-stock from France and a saw-fly larva in the tip of rose 

 stock imported from England. 



The inspection of growing stock in the nurseries commenced 

 the last of April. All of the pines were inspected for the Eu- 

 ropean pine shoot moth, and the five-leaved pines for white 

 pine blister rust. A few white pine were found infected with 

 blister rust in one nursery, but as infected pine had been found 

 in the same nursery a few years previous, it was not surprising 

 that new infections appeared. As the blister rust is known to 

 remain dormant for several years, it is possible that outbreaks 

 will appear even later. All Ribes, both wild and cultivated, 

 have been removed from around the nurseries that grow any 

 large number of five-leaved pines. This should stop the spread 

 and protect the pines from further infection. 



The summer or general inspection consumed practically all 

 of July, August and September. As a whole, the nurseries 

 were in excellent condition, and especially free from San Jose 



