Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/2002
Publication Date: 7/15/2002
Citation: SAUDE, C., MELOUK, H.A. EFFECT OF CALCIUM ON PEANUT POD BREAKDOWN CAUSED BY SCLEROTIUM ROLFSII. PHYTOPATHOLOGY. 2002. V. 92(6). P. S72. PUBLICATION NO. P-2002-0524-AMA.
Technical Abstract: Greenhouse experiments were conducted to evaluate the effect of CaCl2 at rates of 37 and 74 kg/ha and CaSO4 at rates of 368 and 552 kg/ha on peanut pod breakdown in the cultivar Okrun. Pods were produced in 18-cm dia pots in a soil mix (sand: soil: peat; 2:1:1; v/v/v). Finely ground CaSO4 and CaCl2 were applied to soil at 75 days after planting (DAP), and the controls received no additional calcium. At 100 and 120 DAP, pods were singly inoculated with 2 sclerotia of S. rolfsii, and with the pegs intact were placed in 7-cm long tube-like pouches made from a 2.5-cm dia dialysis tubing (12,000 MCOW) and returned to soil. Pod breakdown was evaluated periodically and at harvest. Pods inoculated at 100 DAP had similar pod breakdown in all treatments. However, pods inoculated at 120 DAP in the CaCl2 (37 kg/ha) had 11% pod damage compared with 34% in CaCl2 (74 kg/ha) and 19% in no additional calcium. Both rates of CaSO4 had 6% pod damage. These results suggest a beneficial role of calcium in reducing peanut pod breakdown caused by S. rolfsii.