5° 



PLANT CULTURE 



11. Carbon-bisulphide. For weevils in stored grain use 

 H pound to 1,000 cubic feet of air in an air-tight bin. Place the 

 carbon-bisulphide in a pan at the top. The gas, being heavy will 

 disseminate through the whole bin. It is sometimes used for root 

 insects and is poured into holes in the soil. Never get the gas near 

 an open flame — it is very inflammable. 



12. Combination Sprays. One spraying may suffice for the 

 control of insects and diseases by using 3 pounds of arsenate of 

 lead mixed with the Bordeaux mixture or the lime sulphur solution 

 of 50 gallons. 



COMMONER DISEASES AND INSECTS AFFECTING 

 ORNAMENTALS 



(The numbers and letters refer to controUing remedies.) 



Ants. Use hot water or 11. Ants 



are thought to spread Peony 



bud rot. 

 Aphides. 1, 2, 3. 

 Aster bug, black. Use soap dis- 

 solved in 1. 

 Black spot. B; very difficult to 



control. 

 Borers. Make slit in stems of 



herbaceous plants to kill the 



borer. 

 Bud moth. 6, 12. 

 Cabbage worm. 6, 7 and after 



heading use 8. 

 Carnation rust. In field use A; 



in greenhouse use C. 

 Caterpillars. 6, 7, 8, 11. 

 Currant borer. Cut off cane and 



burn. 

 Currant worm. 6 and 8. 

 Cut worm. 9. 

 Damping-off. F. 

 Euonyraus scale. Burn infested 



twigs, spray with 1 in June to 



kill the young. 

 Fig-leaf diseases. Use A. 

 Flea beetles. 6 often effective. 

 Gooseberry mildew. A. 

 Grain smut. F. 



Hollyhock rust. Use A just as 

 plants come up in Spring. 



Lace wing fly on Rhododendron. 2. 



Leaf-eating worms. 6, 7, 8, 11. 



Leaf spots. A, B. 



Lice. 1, 2, 3. 



Lilac mildew. C, D. 



Maggot. 6, 7 when sweetened 

 used to control the adults; 11 

 for the larvae below ground. 



Marguerite leaf miner, 1. 



Mealy bug. Spray with good pres- 

 sure; 5 or 10 is also good. 



Mildew. C, D. 



Millipedes. 9; lime and salt may 

 be used where plants are not 

 injured. 



Moles. Trap or use young corn 

 poisoned with strychnine. 



Nematodes. Sterilize soil with 

 steam or use fresh, uninfested 

 soil. 



Peach-leaf curl. E. 



Peony bud rot. Use A just as 

 plants come up in Spring. 



Phlox mildew. B, D. 



Plant lice. 1, 3. 



Potato blight. A, every 10 days. 



