NO. l8 SENSE ORGANS OF COLEOPTERA — McINDOO I7 



attractive to the celery leaf -tier. If it is attractive to such diverse 

 insects as wireworms and caterpillars it is quite possible that it will 

 be found of value against a large number of insects. 



Melander (50) states that a dough made of flour or bran proved 

 very attractive to wireworms, but the addition of sugar, oranges, 

 lemons, etc., added little to the drawing power of the baits. 



Since the larvae of certain tenebrionid beetles are destructive, why 

 not attack the evil at the source by destroying their parents? This 

 was the way Wakeland in Idaho reasoned during the season of 1921. 

 After discovering that these beetles feed greedily for a month before 

 egg-laying time, he next found out that they could be easily killed 

 during this period by feeding them poisoned-bran bait, thus largely 

 eliminating them before they had a chance to start a new generation. 

 The following season he (93) continued his experiments and states 

 that the bait used consisted of bran, Paris green, amyl acetate, and 

 water. It was distributed broadcast or in the bottom of furrows, 

 plowed at regular intervals, over an area of 18,000 acres. This method 

 is said to be practical and economical, because the beetles were ef- 

 fectively killed at a cost of about two and a half cents per acre for 

 materials, and the labor in vol veil was not a large item. 



In 1920 Jack (29) in Rhodesia poisoned the adults of certain 

 tenebrionids by using the bait recommended against cutworms. 



Swenk (84) remarks that a promising remedy against the adults of 

 Eleodcs opaca is a bait prepared by mixing, dry, 25 pounds of coarse 

 wheat bran and i pound of Paris green, to which is added f ounces 

 of amyl acetate in enough water to make a stiff mash. This quantity 

 is sufficient for several acres when put in furrows. 



Other species of tenebrionids in the United States (8), Russia {y2>)^ 

 and Rhodesia (30) are more or less controlled by poisoned baits. In 

 Southern Rhodesia several formulas have been used (31) success- 

 fully against so-called wireworms (tenebrionids). One of them is 

 made of chopped green stuff, dipped in a solution consisting of i 

 pound of sodium arsenite, 8 pounds of cheap sugar or i gallon of 

 molasses, and 10 gallons of water. This bait may be broadcast or 

 applied like bran bait. 



(b) baits 1-ur strawberry-root weevils 



During the past 25 years strawberry growing in the western parts 

 of Washington, Oregon, and British Columbia has been handicapped 

 by strawberry-root weevils. For 20 years or more many efforts have 

 been made to develop a remedy for this serious pest, but not until 

 recently has a satisfactory control measure been discovered. An 



