Control of nematode parasites of potato with certain pesticides and their persistence in soil | ||
Journal of Pest Control and Environmental Sciences | ||
Volume 14, Issue 2, December 2006, Pages 143-153 PDF (157.45 K) | ||
Document Type: Original Article | ||
DOI: 10.21608/jpces.2006.460732 | ||
Authors | ||
Said S. M. Soliman* ; Shereen A. Abdel-Aziz; Ahmad A. M. Deabis | ||
Central Agriculture Pesticides Laboratory | ||
Abstract | ||
A field experiment at Dakhleya, Governorate was carried out to evaluate the efficiencies of four nematicides namely; ethoprophos, cadusafos, oxamyl and fenamiphos and the fungicide, pencycuron against two genera of nematodes; Meloidogyne Tylenchorhyenchus, in addition to the citrus nematode, Tylenchulus semipenetrans on potato, where potato was cultivated under grapevine trees. Nematicides gave satisfied reduction in the population densities of nematodes during the experimental period. Ethoprophos offered the best efficiency against the nematodes, where the reproduction rates of nematodes were low. Oxamyl and fenamiphos gave also good control. A comparative study was conducted on the persistence of ethoprophos and pencycuron in soil and in potato tubers. Residues analysis data showed that the initial deposits of the ethoprophos and pencycuron in the upper 10 cm of the soil surface were relatively high. Ethoprophos showed rapid decrease to 2.56 ppm within 10 days after application revealing 91.49 % loss. Graduated dissipation of the applied ethoprophos from soil surface was noted through the following intervals. Ethoprophos residues were 0.02 ppm showing 99.93 % loss after 90 days. On the other hand, pencycuron residues were more stable than ethoprophos under experimental conditions and recorded a percentage loss of 31.98 after 10 days from treatment, while after 90 days the residues was 0.05 ppm, showing 99.93 % loss. No residues of ethoprophos could be detected in potato tubers at harvest (90 days after application), while 0.135 ppm pencycuron residues were found in outer covering of potato tubers after 90 days of application. According to the rate of dissipation, the estimated halflives of the ethoprophos and pencycuron in soil were 62.7 and 90.07 hrs, respectively. | ||
Keywords | ||
Plant-parasitic nematodes; potato; control; nematicides; residues; population densities | ||
Statistics Article View: 1 PDF Download: 1 |