242 Maine Agricultural Experiment Station. 1917. 



soil ; carbon bisulphide ; formaldehyde ; Nikoteen ; Black Leaf 

 40; kerosene emulsion and carbolic acid emulsion. No adults 

 emerged when various quantities of potassium cyanide was 

 added to soil containing puparia- but defoliation resulted. 



The currant fruit fly was not attracted to vegetable and 

 petroleum oils used in traps. 



Fowls when allowed to run at large under currant and goose- 

 berry bushes, are said to destroy many puparia. To avoid loss 

 of fruit, fowls should be placed in the berry patch after the crop 

 is harvested and in early spring before the fruit is set. An 

 objection raised against this method, is the fact, that the hens 

 scratch large holes below the bushes and expose the roots. No 

 puparia can pass through the digestive canal of fowls and issue 

 as flies. 



If the picking of the crop is delayed until August 1, at 

 Orono, Maine, practically all fruit which remains on the bushes 

 would be free from maggots. If late picking is adopted, the 

 danger of losing some of the sound fruit through sun scald must 

 be taken into consideration. 



In 1914, the results of spraying the foliage with arsenate 

 of lead added to diluted molasses showed a loss of 24 per cent of 

 the crop of gooseberries in a commercial garden consisting of 

 100 currant and gooseberry bushes. In three adjacent dooryards 

 41, 55 and 64 per cent of the gooseberries were infested. The 

 cost of the insecticide for 8 applications of the spray to 100 

 bushes not including labor amounted to $.65. 



In 1915, a baited gooseberry bush growing in the shade 

 showed a loss of 33 per cent of the berries compared with 79 

 per cent of infested fruit on the check or control bush similarily 

 located while a treated and untreated gooseberry bush in the sun- 

 shine showed an infestation of 17 per cent and 29 per cent res- 

 pectively. The poisoned bait, consisting of sodium arsenite and 

 diluted molasses, was applied to the lower branches of the bushes 

 with a bucket pump, while the upper branches were baited with 

 a paint brush. The cost of four baitings applied to 35 currant 

 and gooseberry bushes without labor amounted to $.575. 



If currant and gooseberry bushes are sprayed during the 

 flowering period there is a possibility that the bees may be poi- 

 soned through feeding in spray-poisoned blossoms. The first 

 application of the spray, however, should be made at a time 



