Effect Of Tropical storage and It´s period On Some Pesticides Stability and Biological Evaluation against The dust mite of date palm Oligonychus afrasaiticus (McG) (Acari: Tetranychidae) In The Field
Basrah Journal For Date Palm Research,
Volume 6, Issue 1, Pages 22-42
AbstractThe study was carried out to deterging the tropical storage effect (40 and 54
±2) C°and storage period (4,8,12 and 16)weeks on stability of Hophos ,
Endosulfan and Vap – Malathion by stability test , acidity and wettability , In
addition to biological evaluation of pesticides before and after them storage
against the spider mite dust Oligonychus afrasaiticus on date trees fieldly.
The results showed that the tropical storage cause in formulating oily layer
separation of Hophos and cream sedimentation of Endosulfan ,The Hophos
affected more than Endosulfan and this affected increased by increasing of the
temperature and the storage period .
The study showed the thickness of layer and cream sedimentation were
more when the usage the hardness water , whereas the normally water.
The results elucidated the affecting of the wettable powder formulation by
tropical storage, so the wettability was not exceeded after 16 weeks of storage in
( 40 and 54 ±2) C° 2 minutes respectively.
Acidity of tested pesticides were increased by increasing the temperature.
The Hophos was more acidity followed by the Endosulfan and vap – Malathion.
About the biological evaluation of pesticides , The vap – Malathion surpassed in
decreasing the number of dust mite from 35.3 mite 10 fruits to 2.6 mite 10 fruits
after 14 days from treatment with out any significant difference before the storage of
pesticides in (40 and 54 ±2) C° and unstorage pesticides, the ratio of numbers of mite
reached to 9.4, 10.8, 10.8 mite 10 fruits respectively after 14 days from the treatment.
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