مسح لانتشار مرض التعفن الفحمي Macrophomina phaseolina (Tassi)‎ Goidanich و تقدير أضراره على فول الصويا في العراق

الملخص EN

A field survey of farmers soybean fields was carried out during 1998/1999 and 1999/2000 in Baghdad, Diala and Tameem provinces to determin the Incidence and economic damage of charcoal rot Macrophomina phaseolina (Tassi) Goidanich on soybean crop in Iraq.

The study revealed that soybean plants infected with this pathogen were 8% in 1998/1999 and 4.8 % in 1999/2000.

Infection with this pathogen has reduced the number of pods per plant, seeds per pod, 100 seed weight and finally plant seed yield.

Means of traits of infected plants were 67.7 pods/plant, 1.5 seeds/pod, 6.5 gm/100 seed and 6.4 gm/plant, respectively, compared to 205.8 pods/plant, 2.2 seed / pod, 15.2 gm / 100 seed, and 69.7 gm/plant of healthy plants.

It was clear that soybean plants infected with charcoal rot have a reduced seed yield representing less than 10% of normal plant seed yield