THE MAXIMAL FLIGHT OF THE APHIDS AND THE SEED FRACTION ACCUMULATION AS CRITERIA FOR INTERRUPTION OF VEGETATION FOR THE SEED POTATO
Abstract
Considering that producing a planting material with high phytosanitary valence takes a lot of effort. after two years of researches that took place in the experimental field from Brasov. tubers with a minimum of virotic infections and corresponding yield have been obtained. This was based upon estimating the optimal period for the vegetation interruption. considering the maximal flight of the aphids and obtaining the highest percent of seed tubers. correlated with the sum of thermic degrees during the vegetation period. as two principal criteria which had to be met. Until now. the moment of vegetation interruption of the seed potato cultures was established taking into account the maximal flight of the aphids; in our case. for the semi-early potato varieties (e.g. Ostara). the second evaluation criteria for the vegetation interruption. based upon obtaining the highest percent of seed tubers. was used. For the medium late Desireé potato variety and the late Eba variety. the criteria used to estimate the optimal moment for the vegetation interruption was the maximal flight of the aphids. which took place before obtaining a satisfactory quantity of seed tubers (30-55 mm).
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