LIME-SULPHUR A STOMACH POISOX FOR INSECTS. 



89 



Table VII. — Tests of the killing effect of lime-sulphur on the pear slug (Eriocampoidts 



cerasi L.). 



| Experiment started Aug. 24, 1912, Benton Harbor, Mich., 6 larvae in each lot.] 



Date of examination. 



Larvae dying in each lot. 



Lot 1 (6 

 larvae)— Check 



(unsprayed). 



Lot 2 (6 Lot 3 (6 

 larvae) — Lime- larvae)— Lime- 

 sulphur, 1 £-50. sulphur, H— 50. 



Aug. 25 





3 

 2 



1 



" ~4~ 

 2 



26 





27 





28 





29 



Total number dead. . . 

 Number of da vs required to 

 kill... 



















6 

 3 



0.08 



6 



3 



0.05 



Square inches of foliage 

 consumed 



1.69 



Three days were required to kill all the larvae on the sprayed lots. 

 At the end of five days, when the experiment was closed, the larvae 

 on the unsprayed lot were apparently in a normal condition. 



MISCELLANEOUS TESTS. 



Preparations were made to conduct a number of feeding experi- 

 ments on the killing effect of lime-sulphur on the second brood of 

 codling-moth larvae (Carpocapsa pornonella L.). But since a suffi- 

 cient number of larvae was not obtainable, owing to the small size of 

 this brood appearing in Michigan, no satisfactory tests could be 

 made. Neither were there any tests with lime-sulphur alone made 

 against this insect in the field. However, in the case of a plat of 

 Ben Davis apples, sprayed three times with lime-sulphur, 1-50, and 

 10 per cent kerosene emulsion, no arsenical being used, the total 

 percentage of windfalls and picked fruit free from the codling moth 

 was 90.18, as against 41.31 per cent of fruit free from this insect on 

 the unsprayed plat. Lime-sulphur, 1-50, and fish-oil soap, 7 pounds 

 to 50, without an arsenical, hi the same orchard held the codling 

 moth to 88.19 per cent of sound fruit. The effectiveness of lime- 

 sulphur alone in controlling the codling moth and numerous other 

 insects will be further tested during the season of 1913. 



A few laboratory tests were made of the killing effect of Bordeaux 

 mixture, 3-4-50, on the fall web worm and about as effective results 

 were obtained as from lime-sulphur solutions. 



Self-boiled lime-sulphur, 8-8-50, the preparation used for spraying 

 peaches in foliage, was tried against the fall webworm without any 

 killing effect. Sulphur alone, 8-50, and lime alone, 8-50, likewise 

 were ineffective. 



