9 



París green or wliite arsenic 1 part 



Salt 2 parts. 



Fresh horse manure 60 parts. 



Water sufficient to moisten. 



OTHER ARSENACALS.— In addition to the poison sprays 

 mentioned, there remain a number of others, whieh are sometiems 

 used, but whieh for various reasons are scarcely applicable te 

 Cuban needs. Among these are London purple, arsenite of soda, 

 and arsenite of lime. 



HELLEBORE. — White Hellebore is a vegetable poison 

 whieh deteriórales when exposed to the air, henee the period of 

 effectiveness following its applieation is of a fevv days duration 

 only. It is for this reason that it may be safely used upon plants 

 that are to be eaten shortly such a eabbage and it is in the foreg- 

 oing eonnection that it is usually employed. It is less virulet in its 

 action and henee less sure of results, than some of the other 

 poisons. The material may be applied as a dust or a liquid. 

 For the dust applieation, the unadulterated hellebore may be 

 dusted upon the the plants. Por the liquid spray, the hellobore 

 is mixed with water at the rate of one ounce to three gallons, 

 or 28 grams to 11.4 litres. 



CONTACT SPRAYS 



Thecontact sprays are used generally aganist iaseets tliat do 

 not feed by devouring bodily the plant tissues, but whieh possess 

 mouthparts in the from a beak with whieh the surfaees are pier- 

 ced and the food extraeted in the from of sap. Fig 2. The contact 



Figure 2 



