Effect of potassium and magnesium fertilization on barley preference by the bird cherry-oat aphid (Rhopalosiphum padi)
1998
Havlickova, H. | Smetankova, M. (Vyzkumny Ustav Rostlinne Vyroby, Prague-Ruzyne (Czech Republic))
The effect of K and Mg on preference of the bird cherry-oat aphid Rhopalosiphum padi for barley and on suitability of the plants for aphids was studied in an open hall during three vegetation periods. Plants of the spring barley cv. Zenit cultivated either in soil with a low K content or in soil rich in K, resp., were treated with four fertilizer combinations (NP, NPK, NPMg, NPKMg). Under conditions of free host choice aphids showed a higher preference for plants growing in K deficient soil or treated with fertilizers devoid of K (NP, NPMg variants), while plants cultivated in soil rich in K or treated with NPK showed low attractivity. The mechanism and expression of resistance to aphids induced in cereals by the nutritional conditions and treatment with different fertilizers are discussed.
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