تأثير مرض الطرف الأسود للحبة و المعاملة بالمبيدات للحبوب على عفن الجذور في القمح في وسط المملكة العربية السعودية

Abstract EN

The black point disease of wheat is widespread in locally produced and imported wheat seed in central Saudi Arabia and other parts of the world.

The objective of this study is to determine the effect of this disease and seed treatment with fungicides on common root rot of wheat in the field.

Black pointed seeds of "Yecora rojo" cultivar were separated from healthy seeds.

Infected and healthy seeds were treated with CQ 560 60.6% WP (Prochloraz Mn-complex 10.4% + Carboxin 50%), CQ 638 50% (Prochloraz Mn-complex 10.8% + Carbendazim 40%) or Vitavax 75% WP (Carboxin 37.5% + •Ihiram 37.5%) at a rate of 3 g a.i/kg seeds.

Non treated seeds served as the control.

The experiment was conduced in 1987 and 1988 growing seasons.

It was concluded that the black point disease of wheat has no significant effect on root rot of seedlings (30 days old) or mature plant (80 days old) in the field.

Seed treatment with fungicides significantly reduced the incidence of the disease in both stages of growth.

The CQ 628 fungicide was the most effective while Vitavax was the least effective fungicide.

Treatment with fungicides increased grain yield significantly in the field regardless of black point disease in the two growing seasons