514 EXPERIMENT STATION RECORD. 



explained further that in cases of crown gall, woolly aphis, and some other of the 

 more injurious pests, the nurserymen were requested to discard badly affected stock, 



Mr. Burgess reported that in Ohio the presence in a nursery of the San Jose scale,. 

 black knot, or peach yellows was sufficient ground for withholding certificate, and 

 that plants infested with woolly aphis or affected with crown gall were caused to be 

 destroyed. He stated that the oyster-shell bark louse was doing considerable 

 damage in Ohio, and so far as iiractical its dissemination on nursery stock was 

 prevented. 



Mr. Phillips reported that the jiractice in Virginia was to withhold certificate frorn^ 

 nurseries in which San Jose scale, black knot, or peach yellows was found until the 

 trouble was effectually eliminated. Peach yellows had not so far been found in the 

 nurseries, but diseased orchard trees in the neighborhood of a nursery sometimes 

 occurred, and these were destroyed before a certificate' was granted. The same was 

 true of black knot. He stated further that severe cases of crown gall, woolly aphis, 

 and pear blight were not admitted under certificate. Plants actually showing the 

 presence of such pests were discarded. 



Mr. Forbes required the Illinois inspectors to send in a statement of every pest 

 found in the nursery, and before a certificate was granted he required the elimina- 

 tion of the San Jose scale and black knot. Precautions were taken to avoid sending 

 out borers, woolly aphis, crown gall, and pear blight. Plants infested with woolly 

 aphis to the extent of causing warty formations on the roots were discarded, and so 

 also were plants visibly affected with crown gall. Noticeable infestation of the scurfy 

 scale and bad cases of oyster-shell bark louse were rejected. 



Mr. Scott stated that in Georgia the presence of the San Jose scale, Diaspis jjenta- 

 gona, black knot, or rosette would prevent the certification of a nursery; that stock 

 seriously affected with crown gall, root knot, or woolly aphis was not allowed to be 

 sent out under certificate; and that stock infested with the cherry scale, scurfy scale, 

 or oyster-shell scale was caused to be properly treated before it was distributed. It 

 had been his practice in suspicious cases to have the stock inspected on the heeling-in 

 grounds for crown gall, woolly aphis, and scale insects. 



Observers differed in regard to the prevalence of crown gall. This was reported 

 as confined to the apple in Illinois and Virginia, to the peach in New Jersey and 

 Florida, and equally common on the peach and apple in Georgia. 



Mr. Engle, of Pennsylvania, called attention to the black peach aphis, which in 

 his opinion all inspectors should rule against. 



A motion was adopted calling for the appointment of a committee of three, includ- 

 ing the chairman, to compare all existing laws concerning the control of insects and 

 diseases in the nursery or orchard, suggest points to be covered in State legislation, 

 and formulate suggestively uniform State and Federal legislation to regulate nursery 

 inspection, interstate traffic, and orcliard control, this committee to report at the 

 next meeting. 



With reference to the procedure taken in cases of nursery infestation with scale or 

 other dangerous pests, Mr. Scott stated that the Georgia law prohibited the certifica- 

 tion of a nursery when any portion of it was found infested, and that he had dis- 

 posed of such cases according to the individuality of the nurseryman, as well as 

 the circumstances attending the case, in the following manner: Case 1. — A por- 

 tion of a large nursery was found infested with San Jose scale, and as agreed 

 to by the owner its customers were notified of the exact conditions, with assurance 

 that the stock actually infested would be burned and the remainder fumigated under 

 supervision. To the surprise of both the owner and himself not a single order was 

 countermanded and practically the entire stock was disposed of at the customary 

 prices. Case 2. — Upon the inspection of a certain nursery a single specimen of San 

 Jose scale was found upon a plum leaf, and in spite of a most careful examination no 

 further infe.station could be found at that time. A second inspection at the heeling-in 

 grounds revealed a slight infestation of a dozen or more trees, which were thrown 



