246 JouHNAL OF THE Depaktmext OF Agkiculture. — Sept., 1922. 



go to the orchard when the fruit is large, and therefore difficult to 

 keep covered with poison (1). Hundreds of adult codling-moths that 

 developed from larvae hibernating in the fruit shed at Elsenburg 

 were found flying in the fruit storeroom as late as the first of 

 January this year, the time when the tliird application of lead 

 arsenate had already been applied in the orchard ! Califoruian fruit 

 growers have reported the capture of thousands of moths in their 

 fruit sheds (2), (3). 



In the Elsenburg fruit storeioom a very successful trap hu> 

 recently been erected to capture all larvae leaving infested fruit while 

 it is waiting to be cut up for drying. This trap (see figure 1) has. 

 in two months captured over 3000 larvae from a comparatively small 

 amount of infested pears. The structure is very simple, consisting 

 of a narrow board 1^ in. Avide and l iu. thick, nailed firmly to and 



V^gll ^^///x'/^' 



Figuiv 1. 



along the top oi one side of a, ceiling board. Both boards, firmly 

 Fastened to each other, are then screwed tightly against and along 

 each wall of the storeroom, parallel with and two feet from the floor, 

 and are so attached that the top edge of the narrow board is level 

 with the top edge of the ceiling board, the tongue of wliich has 

 previously been planed away. 



They are put in such a position tliat there is a space tlie thick- 

 ness of the narroAv board between the lower two-thirds of the ceiling 

 board and the wall of the room. jN'arrow r-.trips of bagging are stuffed 

 in this space to serve as an attractive place of shelter for the codling 

 larvae. Tree tanglefoot, a material similar to ily-paper tanglefoot, 

 is then placed along the top of both boards to prevent any possibility 

 of larvae crawling over the trap, up the wall to the cracks in the 

 wood of the ceiling. The structure is screwed to the wall in wooden 

 pegs driven into holes drilled in Hie wall. 



