ENTOMOLOGY. lb'l 



placed at $84, reckoning- the cost of a tent at 87. With such an outfit 

 102 large 12-foot trees can be treated per night (the best time to work) 

 of 12 hours. Smaller trees would require more tents, but 200 trees per 

 night could be treated. The amount of chemicals required for a 12-foot 

 tree is placed at If fluid oz. of sulphuric acid, 11 of water, and 5J oz. 

 avoirdupois of 08 per cent potassium cyanid. If the foliage be wet a 

 little more of the chemicals is necessary. This makes a cost per tree 

 of about 1 cts. For treatment of nursery stock a double air-tight 

 chamber is recommended. The time of exposure is placed at at least 

 45 minutes. 



The San Jose scale and how it may be controlled, J. B. Smith 

 (New Jersey Stas. Bui. 125, pp. 16, Jig. 1). — The author here gives a sum- 

 mary of observations and conclusions, the details of which are to appear 

 in the Annual Report of the station for 1807. 



At the outset no hope of exterminating the scale in the State is held 

 out, although it may be kept within control. The insect is well estab- 

 lished along the Delaware River from Burlington to Camden in gardens, 

 orchards, and hedges, and another colony exists at Jersey City Heights 

 where it is believed to have been carried by birds. The country about 

 Parry within a radius of 10 miles contains many infested places. "The 

 entire section of the State north of the red shale line, running obliquely 

 irom Trenton on the Delaware to a point north of Perth Am boy on the 

 Kill von Kull, is yet free, excepting only the spur already mentioned, 

 which includes Jersey City and runs north as far as Hackensack." 



Although the insect has existed in the State for ten years the damage 

 sustained is comparatively slight and local. "Practically none save 

 peach trees have been actually killed," and "uo single fruit grower has 

 sustained serious injury." 



So far as examinations made in 1807 can show there are but two 

 large nurseries within the State having more than a local trade that 

 have traces of the scale, and these are slight. Four, possibly five, 

 nurseries in Burlington, Monmouth, and Atlantic counties with a local 

 trade are infected. The purchaser should demand a guaranty from the 

 grower rather than a certificate. 



There can be no doubt as to the destruction to certain fruits, peaches 

 being especially sensitive and following them thin-leaved varieties of 

 plums. Other varieties, and large trees as compared with young trees, 

 suffer less. The latter fact is owing partly to the scale not being able 

 to develop well in the shade, a statement that is particularly true in 

 moist weather. 



In conclusion, past experience proves that a single application of any 

 remedy should not be relied upon, but that after a thorough treatment 

 of the infested trees, continual vigilance must be exercised and all 

 omissions promptly attended to with secondary treatment. Little hope 

 is to be had from natural checks save the effect of moist weather, cold, 

 and shade. The California ladybirds introduced have not survived, 



