248 TRANSACTIONS OF THE HORTICULTURAL 



corolla were perforated with small round holes, and eaten away 

 from the edge. 



Three specimens taken in Southern Illinois were dissected 

 April 23, and found to contain vegetable tissues, chiefly of leaves 

 (as shown by the fragments of spiral vessels), without fungi, and 

 with more or less chloryphyl. Vegetable hairs and peculiar 

 pollen grains, not those of fruit blossoms, were also recog- 

 nized. 



Thinking it possible that the curculio might feed on flowers 

 somewhat indiscriminately, we put a number under a bell glass 

 with roses in full bloom. The next day, May 19, the petals were 

 much eaten, and two days later, calyx and peduncles had likewise 

 been attacked. The rose leaves were not injured. When rose 

 blooms and peach leaves together were offered the imprisoned 

 beetles, they fed freely on both. 



Again, May 23, curculios were confined with both bush honey- 

 suckles and snowballs in blossom. The next day the honeysuckle 

 blossoms were eaten, and on the second day those of the snow- 

 ball also. On the other hand, beetles shut up with peach leaves 

 and peony flowers, ate the peach at once, as usual, but refused 

 the peony entirely, not having eaten it at all after ten days. 



INSECTICIDE EXPERIMENTS. 



• 



My first experience with insecticides for the curculio alone 

 were made July 6, 1888. Two lots were placed under glass, with 

 leaves and green fruit of the plum, the food of one being 

 sprayed with Paris Green, one pound to fifty gallons of water, 

 and the other not. The first beetle died in the poisoned jot 

 July 9, and the next day all were dead, the check lot continuing 

 without loss. July 28 a similar experiment was made with Paris 

 Green, one pound to one hundred gallons, applied until the 

 leaves began to drip. The poisoned beetles commenced to die 

 the next day, and five of the six were dead on the 31st. In the 

 check lot of six, on the other hand, only one was dead. 



An experiment begun with one pound to 200 gallons was 

 unavoidably suspended in two days, before results were 

 reached. 



Next, April 19, 1889, a lot of curculios, greatly exhausted by 

 long confinement in transit, were divided into five lots — the first, 

 of twenty-four, a check; the second and third, of twelve each, 

 the fourth, of nine, and the fifth of twelve. The food of the 

 second lot was treated with Paris Green mixed with water at a 

 rate of one pound to one hundred gallons; that of the third, with 

 a pound to 200 gallons; the fourth, a pound to 300, and the fifth, 

 a pound to 500 gallons. 



The previous hardships of the check lot caused many of 

 them to die, most of them having been insensible, in fact, when 



