44 research outputs found

    Economic Thresholds for Central European and North American Wheat Insects

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    The economic thresholds for implementing control of 24 wheat insect pests from Central Europe and North America are discussed. Additional studies on wheat pests are necessary to better define the existing thresholds

    Untersuchungen zum Einfluß von Getreideblattläusen auf die Ertragsbildung bei Winterweizen.

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    In Kleinstparzellenversuchen zum Schadausmass von Macrosiphum avenae (Fabricius) bei Ährenbefall an Winterweizen liss sich die Ertragsbeeinflussung bei Abundanzmaxima von 40 Aphiden/Ähre zur Zeit der Milchreife und bei Blattlausindices von > 600 betrugen die Ausfälle mit hoher statistischer Wahrscheinlichkeit > 20%. ...Tests on very small plots to determine the damage caused by Macrosiphum avenae (Fabricius) attacing the ears of winter wheat showed that the yield was not significantly influenced by a maximum abundance of less than 30 aphids per inflorescence or by aphid indices (which are based on the density of population throughout the attack) of less than 400. Whith a maximum abundance of more than 40 aphids per ear in the milk stage or with aphid indices higher than 600 there was a hihgt statistical probability of losses gerater than 20 per cent. ..

    Pseudorapidity distributions of charged hadrons in proton-lead collisions at root s(NN)=5:02 and 8.16 TeV

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    The pseudorapidity distributions of charged hadrons in proton-lead collisions at nucleon-nucleon center-of-mass energies root s(NN) = 5.02 and 8.16 TeV are presented. The measurements are based on data samples collected by the CMS experiment at the LHC. The number of primary charged hadrons produced in non-single-diffractive proton-lead collisions is determined in the pseudorapidity range vertical bar eta(lab)vertical bar vertical bar(vertical bar eta cm vertical bar) <0.5 are 17.1 +/- 0.01 (stat) +/- 0.59 (syst) and 20.10 +/- 0.01 (stat) +/- 0.5(syst) at root s(NN) = 5.02 and 8.16 TeV, respectively. The particle densities per participant nucleon are compared to similar measurements in proton-proton, proton-nucleus, and nucleus-nucleus collisions.Peer reviewe