100 STATE HORTICULTURAL SOCIETY. 



However, the leaves would have to be collected early in the season 

 since when the leaves dry up, the little flaps fall out and sift down to 

 the ground readily when the leaves are stirred. 



In the Spring, just previous to the time of bloom, the moths emerge 

 and continue to emerge for about three weeks. The eggs are laid about 

 four days after emergence and hatch in from four to six days. The 

 larvae feed about twenty-three daj's, on the average, after which each 

 one cuts one of the little flaps just described and spins up therein, in 

 order to pupate. 



There is a second brood, the adult moths of which appear about two 

 weeks after pupation begins and the process is repeated so that the full 

 grown larvae of the second generation just get nicely enclosed in the 

 leaf flaps before the leaves fall. Now, the damage is done by the larvae 

 which feed on the buds, blossoms and sets during the first generation and 

 in the larger grapes during the second generation. The first generation 

 binds some of the buds and blossoms together with a web and simply 

 devours the little sets in enormous numbers. Since the fruit is so small 

 at this time, very many grapes are destroyed outright in order to furnish 

 sufficient food for the voracious larvae. The work at this time is not 

 so conspicuous as one would expect but the damage is very serious owing 

 to the enormous numbers of small fruit utterly destroyed. These larvae 

 are dark greenish or purplish or tinged with wine-color. The second 

 generation of moths appears after the grape-berries have attained some 

 size and the larvae prefer at this time to burrow inside of the grape- 

 berries, often tying several of the berries together and, of course, ruin- 

 ing the fruit and spoiling the appearance of the cluster. 



Xow, success in controlling the grape-berry moth depends more than 

 anything else on getting the first spray on just at the proper time. If 

 put on too early the rapid growth of the plants spreads the particles of 

 poison so that the larvae may entirely miss getting any and escape. If 

 put on too late the larvae will be inside of their little webs and many 

 will not be touched at all. The exact time to apply the spray would 

 naturallj' be just before the first webs are formed, — the best that we can 

 do is to apply the spraj'^ immediately after the very first webs appear, 

 that is after the first of the fruit buds and blossoms show the tiny webs. 

 The growers should be ready for this spray and be prepared to apply it 

 instantly on the first appearance of webbing. At this time he should 

 use Bordeaux and arsenate of lead, using one and one-half pounds of dry 

 powdered arsenate of lead to a barrel of bordeaux, and some growers even 

 prefer to mix in a little Paris green in order to make the spray act more 

 quickly. The time for spraying usually occurs from three to five days 

 after blooming nicely starts, but the true criterion would be, of course, 

 when the very first webs appear, or when the webs have begun to form. 



Another spray should be applied when the berries begin to touch in 

 the cluster and when they are about the size of buck-shot. The reason 

 for selecting this time is in order that the spray may be made to pene- 

 trate through the cluster and thus poison the interior of the cluster 

 which will be impossible after the berries become closely packed due to 

 their increase in size. Put this spray on while you can still get it to 

 go in between the berries of each cluster, using the trailer method of 

 application because with set nozzles one finds difficulty in hitting the 

 clusters when using our system of trimming and pruning. As a final 



