Abstract
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
| Original language | English |
|---|---|
| Pages (from-to) | 628-633 |
| Journal | Weed Science |
| Volume | 50 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2002 |
Keywords
- pigweed amaranthus-retroflexus
- sheath blight
- take-all
- n-form
- growth
- wheat
- temperature
- nutrition
- disease
- system