oa Journal of the Entomological Society of Southern Africa - The Effect of Low Calcium, Phosphorus or Nitrogen on the Lifecyde of Red Scale (Aonidiella aurantii Mask.)



The incidence of red scale, Aonidiella auranti Mask., varies in different parts of South Africa. This is due to climatic and concomitant conditions, but the question arises whether chemical factors of the soil, and hence the nutrition of the tree, might not have an important bearing on the subject. To investigate this at Letaba a small experiment was started in which young rough lemon seedlings were grown in sand cultures with nutrient solutions in which either calcium, phosphorus or nitrogen, was reduced as compared to the control.


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