تقويم كفاءة النيماتودا Heterorhabditis bacteriophora (Poinar)‎ (Rhabditida : Heterorhabditidae)‎ في قتل عمال و جنود حشرة الارضة Microcrotermes diversus (Silvestri)‎ (Isoptera : Termitidae)‎ عند درجات حرارة مختلفة

Abstract EN

The studies were conducted to evaluated the effect of entomopathegenic nematodes H.

bacterophore at three concentrations 105 , 106 , 107 infective juvenile (IJ) / ml distilled water under 20 , 25 , 30 , 35 + 3oC on mortality of worker and soldiers termite .

The results were showed that nematodes (IJ) had high effects on occurring mortality in the workers and soldiers of the termite while the different in percentage mortality defend on concentration , temperature and exposure time .

Nematodes fullactivity was domenstrated at 20 + 3 oC temperature at which a 100% mortality rate was reached during 14 , 7 , 7 days after treatment with concentrations of 105 , 106 , 107 IJ / ml distilled water respectively .

The mortality rate was decreased with long exposure time at different concentration while the high concentrations had best effect after 90 days with treatment.

On the temperatures 25 , 30 , 35 oC the (IJ) nematode was caused 100% mortality after 14 , 63 and 98 days on concentrations 107 IJ / ml distilled water.

The results were showed that all concentrations of nematodes had affected with different temperatures and caused quick mortality in the beginning of treatment in low temperature 20 + 3oC and caused gradually mortality on the high temperature .

At the laboratory conditions a 100% mortality rate was reached during 21 , 14 , 14 days after treatment at the above mentioned concentrations respectively and the efficiency had been gradually loss in causing mortality in termite .

However termite individuals were still dying until 240 days but no dead ones were observed after 360 days after treatment .

The termite individuals were repelled in the 7-10 days period after the treatment , therefore a relatively long time was required to reach a 100% mortality.