The occurrence and control of aphids and thrips in winter triticale
Lithuanian Institute of Agriculture, Instituto aleja 1, Akademija, Kedainiai dist., LT58344,Lithuania; remigijus@lzi.lt
Abstract:
Studies were carried out at the Lithuanian Institute of Agriculture during the period 2002–2004. Contact and systemic insecticides were used for pest control in winter triticale. Pesticide application timing was determined according to the threshold of harmfulness of thrips and aphids. In our investigation we used as the threshold of thrips’ harmfulness, 1–2 pests per stem, and for aphids, 5–10 pests per stem. Our results suggest that thrips and aphids were the main pests occurring in winter triticale crops during the experimental years. The occurrence of thrips was more intensive in 2002 and 2003 than in 2004. The occurrence of aphids was the most intensive in 2002, less intensive in 2004. Almost no aphids were found in 2003. The appearance of aphids in 2004 was later compared with that in 2002. Both insecticides reduced the occurrence of thrips and aphids. The winter triticale grain yield was higher in the plots applied with insecticides.
Key words:
aphids, grain yield, insecticides, thrips, winter triticale