August, '21 STOCKWELL: JAPANESE BEETLE QUARANTINE 351 



As a result of scouting operations during the past summer, beetles 

 have been located in considerable numbers throughout a strip of ter- 

 ritor}' about eight miles in length and some over a mile wide in Penn- 

 sylvania along the Deleware River, directly opposite the infested ter- 

 ritory in New Jersey. This infestation has necessitated the placing 

 of a State quarantine by Pennsylvania to supplement the Federal and 

 State of New Jersey quarantine orders in force since June 1, 1919. The 

 two state quarantines are identical with that of the United States 

 Department of Agriculture, except that they prohibit without certifi- 

 cation the intra -state and the Federal inter -state movement of the ar- 

 ticles quarantined. 



Previous to April 1, 1920, green or sugar com was the only article 

 of which shipment was restricted, but at that time regulations became 

 effective to prohibit without certification the transportation from the 

 quarantined area of nursery, ornamental and greenhouse stock includ- 

 ing bulbs, throughout the year, and from June 15 to November 1, 

 farm and garden produce of all kinds, as well as flowers in any form. 



This insect was first discovered in August 1916 in the vicinity of 

 Riverton, N. J., and since that date has spread over an area of approx- 

 imately 85 square miles, 75 of which are in New Jersey and the remain- 

 der in Pennsylvania. The area in New Jersey is mainly a market gar- 

 den and fruit growing section with Philadelphia as its chief market, 

 while that in Pennsylvania is largely a residential sejtion with much 

 less of it given up to farming. A considerable number of greenhouses 

 and nurseries fall within this infested area; some of whom handle only 

 cut flowers, while others have a varied line of plants, bulbs and out- 

 door grown stock. 



The present requirements of all greenhouses shipping potted or un- 

 potted plants are as follows: Potted plants must be potted in soil 

 free from grubs, the soil to be considered as such only when sterilized 

 or obtained a reasonable distance outside the known infested area. 

 After potting, these plants must be kept free from infestation. The 

 roots of unpotted plants must be washed free from soil and in the case 

 of ornamentals requiring earth about the roots an inspection is made 

 of the soil about the roots as the tree is dug, also the nursery blocks 

 must be kept in a clean state of cultivation throughout the season of 

 beetle activity and no beetles found in the immediate vicinity. Dur- 

 ing the past season every attempt has been made to keep greenhouse 

 and nursery surroundings free from attractive food plants and consid- 

 erable spraying has been done with repellents in an attempt to make 



