Efficacy of some Bioagents and Plant Extracts in Controlling TylenchulusSemipenetranson Citrus in Egypt

Abstract

This study was conducted to determine the susceptibility of four citrus rootstock; Sour orange (SO), Volkameriana (VOL), Cleopatra mandarin (CM) and Troyer citrange (TC) to citrus nematode; Tylenchulussemipenetrans and control citrus nematodes by using bioagents and plant extracts under both greenhouse and fieldconditions. In addition to determine the citrus yield (cv. Volkameriana) in Egypt. Data showed that Volkameriana is the most susceptible rootstock; whereas Troyer citrange is the least susceptible rootstock to the citrus nematodes under greenhouse conditions. Seven treatments (Psudomonasfluorescens, Arthrobotrysoligospora, Trichodermaharzianum, Origanummajorana,Tageteserecta, Eucalyptus globules, at different concentrations, and oxamyl (24%)) were used to control T. semipenetrans under both greenhouse and fieldconditions on citrus. The most effective treatment in controlling citrus nematodes; T. semipenetrans was Psudomonasfluorescens whereas the least effective was suspension of Eucalyptus globules under both greenhouse and field conditions. Psudomonasfluorescens was more effective in reducing numbers of egg laying females, number of eggs/ egg-mass and number of second stage larvaein the soil, whereas the suspension of Eucalyptus globules was the least effective under both greenhouse and field conditions. Under greenhouse conditions all treatments led to increase the total fresh weight of shoots and roots of citrus seedlings especially at the highest concentration. The application of treatments achieved high decrease in nematodes population in both roots and soil under both greenhouse and field conditions also, increased the yield of citrus under field conditions.

Efficacy of some Bioagents, Algal Species and Plant Extracts in Controlling Meloidogyne Incognita on Yield of Grape Vines in Egypt

“…can produce various toxin metabolites and different enzymes that improve photolytic activity of the antagonist and control of nematodes. et al, 2001;Faruk et al, 2002;Siddiqui & Shawkat, 2004;Shawky & Abd El-Moneim, 2005;Sahebani & Hadavi, 2008;Abd El-Moneim et al, 2010 andAl-Ghonaimy, 2015).…”

“…al., 2003;Ali, et. al., 2012 andAl-Ghonaimy, 2015). Ambrosia maritima (damsisa) as intercropped plants with soybean (Glycine max) cv.…”

“…The impact of aqueous plant extracts on plant parasitic nematodes has been reported by several authors. Plant extracts of Eucalyptus; Eucalyptus globules has nematicidal effect on nematode population according to (Shaukat et al, 2003;2006;Ali, et al, 2012 andAl-Ghonaimy, 2015). Ambrosia maritima (damsisa) as intercropped plants with soybean (Glycine max) cv.…”