EVALUATION OF SPRAY COVERAGE OF MISCIBLE OIL ON CITRUS TREES BY MEANS OF AERIAL AND GROUND APPLICATIONS | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 8, Volume 75, Issue 2, June 1997, Page 363-375 PDF (2.89 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.1997.404757 | ||||
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| Authors | ||||
| MOHAMED A. HINDY; EKRAM I. HELMY; SALAH M. EL-IMERY; NAGWA A. HASSAN | ||||
| Plant Protection Research Institute, Agricultural Research Centre, Giza, Egypt | ||||
| Abstract | ||||
| The present work was carried out to evaluate the quality of spray produced by Mi-2 helicopter and conventional motor sprayer using rates of application 40.0 and 2400 L/fed, respectively. A summer oil (Masrona super oil) was used for controlling red scale insect, Aonidiella aurantii (Order : Homoptera Fam : Diaspididae) and the white fly, Dialeurodes citri (Fam : Aleyrodidae) on sweet orange trees. Due to sufficient down wash created by the helicopter, good spray coverage coinciding to a great extent with the distribution of infestation on the treated trees resulted. The spectrum of oily droplets deposited on citrus trees was bigger in size with 11% and with about 50% less in number than the watery droplets that were recorded under airstrip conditions due to the viscosity factor. The average size and number of droplets collected under airstrip and orchard conditions were 340, pm-60 droplets/cm2 and 443, pm-33 droplets/cm2, respectively. The C.V. % of droplets distribution number on spray collectors was 48%. The total spray lost on ground with aerial and ground application was 15% and 75%, respectively. A positive correlation was found between aerial spray coverage and the control of red scale insect wher mortality percentage increased 1% more by increasing the droplet size with 4.0 pm. The daily performance of motor sprayer and Mi-2 helicopter was about 3.0 and 500 fed./day, successively. The price of aerial spraying of one feddan by aerial means was cheaper by about 56% than the price of motor sprayer. In additon to reducing dose amount with low volume spray by helicopter to the fifth in comparison with motor sprayer. In general the helicopter was superior in controlling red scale insect on citrus than ground motor sprayer. | ||||
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