caa a22 4500 47707314X CHVBK 20180405111432.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF02765801 doi (NATIONALLICENCE)springer-10.1007/BF02765801 El-laithy A. Dept. of Plant Protection, National Research Center, 12622, Dokki, Cairo, Egypt aut Integrated control of two spotted spider mite, Tetranychus urticae on cucumber grown under plastichouse conditions in egypt [Elektronische Daten] [A. El-laithy] Lutte intégrée contre Tetranychus urticae en cultures de concombres sous tunnel plastique en Egypte Microclimatic conditions were monitored in cucumber grown under unheated plastichouses in three consecutive years, i.e. from 1990 to 1992 in Egypt. The relative humidity in the plastichouses constructed on either sandy or clay soil did not exceed 30% during mid-day time, while the average temperature did not drop below 30°C. Such conditions favoured population build up of the two spotted spider miteTetranychus urticae Koch. In 1993 and 1994, three plastichouses planted to cucumber, cultivar Rawa or Hana were selected. Relative humidity in two of them was maintained over 50% during the day using spraying nozzles, the third being kept as control. Mildew diseases induced by increased leaf wetness needed to be managed using fungicides.Phyioseiulus persimilis andP. longipes were released in the first two plastichouses, while acaricides were applied in the control. In early MayT. urticae population increase on the growing top of cucumber plants required two acaricidal applications as predatory mites did not migrate to the apical leaves which were too warm and dry. More than 80% of the maximum yield was obtained on average in plastichouses using increased relative humidity, but without any acaricidal applications. Lavoisier Abonnements, 1996 biological control nationallicence Tetranychus urticae nationallicence relative humidity nationallicence downy mildew nationallicence cucumber nationallicence plastichouse nationallicence Entomophaga Springer Netherlands 41/3-4(1996-09-01), 485-491 0013-8959 41:3-4<485 1996 41 10526 https://doi.org/10.1007/BF02765801 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02765801 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- El-laithy A. Dept. of Plant Protection, National Research Center, 12622, Dokki, Cairo, Egypt aut NATIONALLICENCE 773 0- Entomophaga Springer Netherlands 41/3-4(1996-09-01), 485-491 0013-8959 41:3-4<485 1996 41 10526 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer