ROOT CROPS. 



71 



Prevention. — (1) As "the caterpillars are found in 

 swarms, drawing bushes over the plants disturbs and dis- 

 tributes them advantageously." Then throw lime or lime 

 and soot over the plants — this " will do something towards 

 protection." (2) " A thick sowing of good seed will gene- 

 rally be found to have insured sufficient plants for a crop." 



Fig. 30. — SuKFAOE FuNons or Turnips (Oidium Balsamii). 



B C. Lower and upper surfaces respectively of a turnip leaf. 

 A D. Mycelia (spawn) on both surfaces. 

 E. Stomata. F. Conidia (spores), x 195* 



(3) Watering the plants (by means of a water-cart) is 

 beneficial to the crops and prejudicial to the insects. 



The Surface Mould of Turnips {Oidium Bal- 

 samii, Fig. 30) is a fungus which attacks turnips (especi- 



