TRACKING THE POPULATION DYNAMICS OF DYSMICOCCUS GRASII (8LEONARDO) (HOMOPTERAPSEUDOCOCCIDA)Author:
LORENZO FERNÁNDEZ JOSE MANUEL.
Year:
2004.
University:
LA LAGUNA [
www.ull.es].
Place of defense: FACULTAD DE FARMACIA.
Place of preparation: DEPARTAMENTO DE BIOLOGIA VEGETAL.
Summary: Profit margins of farms tend to be reduced over time because of the perceived imbalance between the need and costs of agricultural inputs and therefore it is necessary to continuously improving productivity. In this sense everything that is reducing production costs has a production is vitally important. This paper seeks to contribute to this by introducing technological improvements in handling D.grasii Leonardi), T.urticae Koch., Chrysodeixis chalcites esper (Lepidóptera: Noctuidae) and D.torulosa (syd.). Ellis through the identification of sampling techniques and precision of integrated control and ecological, both outdoors and in the greenhouse, on the cvs. Large and small dwarf Enana.se has divided the banana growing area west of Palma into three sub-areas defined by the altitude above sea level: 1Â th area 0-100 m 2Â th zone 100-300 meters and 3Â th area of about 30 meters to cover all possibilities of that crop weather and its results have a universal validity. In each area, there was a lot of sampling for oma meteorological data and weekly newspapers of the two individuals in the first species in each body characteristic (lateral bunch, stems peciolares and last garepa pseudostem) the number of leaves of a child-occupied the second kind and characterization through time of the last two species, as well as a test of effectiveness of treatments for controlling Ch.chalcites with B.thuringiensis 0.2%, Finitrotion 0.1% and Chlorpyrifos 0.15 %; comparative another for control with chlorpyrifos 0.15% and Neoscona crucifer (Aranea; araneidae) and a survey of developments in the field of this kind. All this has been carried out assuming a confidence level of 95% and setting the corresponding permissible error. As definitive conclusions can say that we can take as sampling technique of the first two species making random bunch of 30 plants, and make every 15 days, the counts of larvae and adults of D.grassii in the last garepa of pseudostem and lateral leaf cluster and attack and healthy T.urticae on the child, taking the decision to treat as they detected the presence of the bunch. The population structure of G.grassii shows a predominance of larvae on adults. Presence under such garepa individuals Acari: phytoseidae and Cryptamorpha desjardinsi (Coleoptera: cucujidae). The biological control of Ch.chalcites with Neoscona crucifer (lucas 1839) it is possible to a certain to be supplemented with insecticides (chemical or biological) only in extreme cases, damage d.torulosa are from 2% in the ubría and greenhouse and 1% in the sunshine and control is effective with metil-tiofanato. Have been identified for the first time in two species of banana Araneae: araneidae as predators Ch.chalcites: cirtophora citrus cultivation (Forskal 1775) and neoscona crucifer (Luke 1839) this being more abundant and effective, with a diameter of 45 cm spiderweb .
