SOME INSECTS INJURIOUS TO ORCHARD FRUITS 581 



catcher such as has been commonly used in New York may be 

 more convenient. This is used as shown in Fig. 437, the frame 

 being covered with oil-cloth and slanting to a can containing kero- 

 sene for the destruction of the beetles which slide into it. The 

 jarring should be done in the morning, as the beetles do not drop 

 as readily in midday. During the past two years extensive 

 experiments have been made in spraying with arsenate of lead 

 to poison the beetles while feeding, which show that this is much 

 the most satisfactory method of controlling the pest. By spraying 

 with 2 to 3 pounds of arsenate of lead per barrel just after the 

 blossoms fall, and again three w r eeks later on peaches, and with 

 two more sprayings at intervals of ten days on apples, from 60 

 to 90 per cent of the injury from the curculio has been prevented. 

 Only neutral, or nearly neutral arsenate of lead should be used 

 on stone fruits, as a slight amount of soluble arsenious acid will 

 burn the foliage badly. Paris green may be used with Bordeaux 

 mixture on apples, but does not seem to be as effective as arsenate 

 of lead, and is not advised for stone fruits. 



