Efficacy of some bioagents, plants and humex in controlling tylenchulus semipenetrans on olive in Egypt

الملخص EN

This study was conducted to determine the susceptibility of seven olive cultivars to citrus nematode, control citrus nematodes; Tylenchulus semipenetrans under both greenhouse and field conditions.

In addition to determine the olive yield (cv.

Picual) in Egypt.

Data showed that picual cultivar is the most susceptible cultivar; whereas Dolsy cultivar is the least susceptible cultivar to the citrus nematodes under greenhouse conditions.

Seven treatments (suspension of Psudomonas fluorescens, suspension of Arthrobotrys oligospora, suspension of dry peels powder of Punica granatum, suspension of dry leaves powder of Mentha piperita, suspension of dry leaves powder of Eucalyptus globules, at different concentrations, humex (10%) and oxamyl) were used to control T.

semipenetrans under both greenhouse and field conditions on olive.

The most effective treatments in controlling citrus nematodes; T.

semipenetrans are humex (10%) and Psudomonas fluorescens whereas the least effective is suspension of dry peels powder of Punica granatum under both greenhouse and field conditions.

Humex (10%) was more effective in reducing numbers of developmental stages ,egg laying females, number of eggs/ egg-mass and number of second stage larvae, whereas the suspension of dry peels powder of Punica granatum 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 olive seedlings especially at the highest concentration.

Using three times of application every week of each treatment achieved high decrease in nematodes population in both roots and soil under both greenhouse and field conditions.

Also, increased the yield of olive under field conditions.

Key words: efficacy, cultivar, citrus nematodes, T.

semipenetrans, humex, Psudomonas fluoresceins, Arthrobotrys oligospora, Eucalyptus globules, Mentha piperita, Punica granatum, oxamyl and olive.