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The losses of coccinella septempunctata population during the 1st cutting of forage leguminosae


Sbornik UVTI (Ustav Vedeckotechnickych Informaci) Ochrana Rostlin 14(3): 233-236
The losses of coccinella septempunctata population during the 1st cutting of forage leguminosae
In 1977 an evaluation was made of the losses to the imaginal population of C. septempunctata L. during the 1st cutting of alfalfa and clover in central Bohemia [Czechoslovakia]. It was based on the following data: estimation of the portion of C. septempunctata L. population present on forage Leguminosae at the time of 1st cutting (64%); this was made by visual counting of C. septempunctata L. population densities on various crops and the percentage of farm land occupied by these crops; estimation of the percentage of forage leguminosae cropped by chopper harvester (65%); and estimation of the percentage of C. septempunctata destroyed by the chopper harvester (94%). From data 38% of total C. septempunctata L. populations on farm land were destroyed by machine cropping of forage Leguminosae.


Accession: 006712184



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