Common lambsquarters is an annual weed of many important crops Ascochyta caulina is a plant pathogenic fungus that causes necrotic lesions on the leaves and stems of common lambsquarters The objective of the present study was to estimate the effect of plant N supply on the biocontrol activity of A caulina isolates against common lambsquarters; In greenhouse experiments replicated groups of common lambsquarters plants raised with different N supplies were sprayed with various isolates and concentrations of A caulina 3 wk after planting Height, number of leaves, total leaf area, fresh and dry weight, and tissue N concentration of common lambsquarters 4 wk after emergence increased significantly with increasing N supply Disease development was positively related to increasing plant tissue N and also to increasing spore concentration Fungal spore concentration also had a positive effect on the plant tissue N percentage Ascochyta caulina isolate W90-1 caused a greater dry weight reduction in common lambsquarters than isolates I-001 and NW-6 did.
|Number of pages||5|
|Publication status||Published - 2002|
- biological control
- dose response
- spore inocula
- PIGWEED AMARANTHUS-RETROFLEXUS
- SHEATH BLIGHT