Table VII. 

 Experiments in Control of the Pot/Uo Flm-B''etle 



Material. 



Strength of 

 material. 



No. of 

 specimens. 



Dnration 

 of test. 



Alive 



Dead. 



Percentage 

 mortality. 



Remarks. 



Zinc Aroenite, powder . . 





20 



2 days 



2 



18 



90 



All dead after three days. 



Zinc Arsenite, paste 



4 lb. to 50 gals. 



48 



2 days 



4 



44 



91-6 



Plants killed. 



Zinc Arsenite, paste 



4 lb. to 50 gals. 



60 



2 days 



40 



10 



20 



All dead after nine days. 



Paria G-reen, powder 





40 



3 days 



6 



35 



87-6 



All dead after seven days. 



Paris Green, powder 





65 



3 days 



15 



50 



76-9 



All dead in ten days. 



Tobacco DuBt . . 





36 



1 day 



3 



33 



91-6 



The effect seems to vary, acting quickly on 

 some and less so on others. 



Hellebore, powder 





60 



2 days 



6 



54 



90 



Acts quickly, but loses effect rapidly. 



Bordeaux, Lead Arsenate 

 and Blaok.Leaf-40 



5-6-50. 3 lb., 

 1 pint 



51 



2 days 



24 



27 



52-9 



All dead in six days. 



Zinc Arsenite and Black- 

 Lea£-10 



31b., J pint, to 

 50 gals. 



86 



6 days 



20 



46 



69-6 



Leaves become chlorotic and die. 



Lead Arsenate and Black- 

 Leaf -40 



3 lb., \ pint, to 

 50 gals. 



66 



6 days 



14 



52 



78-7 



Leaves burnt by arsenic. 



Lead Chromate, powder 





45 



10 days 



36 



9 



20 



No injury to leaves, but not efficient as insec- 

 ticide. 



Lead Chromate and 

 Black-Leaf-40 



31b., 4 pint, to 

 50' gals. 



68 



4 days 



50 



18 



25-4 



No injury to leaves. 



Lead Arsenate and 

 Molasses 



31b., 3 lb., to 

 50 gals. 



52 



7 days 



16 



36 



69-2 



No injury to leaves at first, but finally turned 

 yellow and died. 



Lead Arsenate and 

 Molasses 



31b., 3 lb., to 

 50 gals. 



66 



5 days 



39 



27 



40- 9- 



No injury at first ; chlorosis followed. 



Lead Arsenate and 

 Molasses 



31b., 3 lb., to 

 50 gals. 



48 



5 days 



19 



29 



64- 1 



No injury at first ; chlorosis followed. 



Blaok-Leaf-40 and Soap 



1 pint, 41b., to 

 100 gals. 



75 



2 days 



30 



45 



60 



Leaves considerably eaten. 



Blaek-Leaf-40 and Soap 



2 pints, 41b., 

 to 100 gals. 



60 



2 days 



26 



34 



56-6 



Leaves considerably eaten. 



Barium Chloride and 

 Molasses 



2 % sol. with 



5 lb. molas. to 



100 gals. 



72 



3 days 



26 



46 



63-8 



Kills plants quickly ; valueless. 



Pyretbrum, powder 





60 



6 brs. 







60 



100 



Very effective, but rapidly becomes weak iu 

 its action. 



Pyrethrum and Sulphur 



Equal parts 



50 



6 hrs. 



5 



45 



90 



Those still alive feeble in their movements : 

 did not. recover. 



Pyretbrum Infusion 



6 lb. to 60 gals. 



50 



10 hrs. 



2 



48 



96 



If covered for only 2 hours the insects revive. 



Sulphur, powder 





46 



1 day 



46 











No feeding done. 



Bor-Deth, powder 





54 



2 days 



24 



30 



55-5 



Non-injurious to the plants. 



Pyrox 



8 lb. to 50 gals. 



46 



4 days 



14 



22 



47-8 



Non -injurious to the plants. 



