Submitted to: Fungicide and Nematocide Tests
Publication Type: Research Notes
Publication Acceptance Date: January 4, 2006
Publication Date: February 26, 2006
Citation: Kousik, C.S. 2006. Evaluation of Ranman 400SC and Omega 500F for management of phytophthora blight of bell pepper, 2005. Fungicide and Nematicide Tests. 61:V010. Technical Abstract: The experiments were conducted in a field infested with metalaxyl sensitive and tolerant strains of P. capsici in Loxahatchee, FL. The soil was Myakka fine sand. Thirteen-week-old seedlings of a susceptible pepper hybrid grown in 98 cell jiffy trays were transplanted on 18 Jan onto slightly raised bare beds with 36-in. centers. There were 4 replications per treatment with 2 rows of 10 plants (20 plants/plot) per replication. Plants were spaced 12-in apart within rows. The first treatment on 18 Jan was a banded application (drench) of the chemicals at the rate of 50gal/A applied using a watering can so as to cover the plant and drench the root area. Subsequent applications were applied as sprays with a hand held pressurized sprayer on 26 Jan, 11 Feb, and 4 Mar. The sprayer was calibrated to deliver 30 gal/A. After the first two sprays, intervals between the applications were extended because of low rainfall and relatively cool temperatures. Silwett L-77 (2 fl oz/A) was added to all the Ranman 400SC treatments. On 11 Mar, Aliette 80WG at 2.5 lb/A was applied to all the treated plots. Agrimek, Provado, Spintor and Kocide were applied twice during the growing period. All treatments significantly slowed the development of Phytophthora compared to the untreated check. By end of growing period, however, severe wilting was observed for most of the treatments. This was most likely caused by the high inoculum pressure in the plots. Overall Omega treatments provided greater protection against the root/collar phase of Phytophthora compared to the Ranman treatments. Bell pepper fruits were harvested on 5 Apr. Fruit set was generally poor and many fruits were damaged by rodents a few days prior to harvest. Hence total number of fruits per plot was recorded. Omega treatments generally yielded more fruits per plot compared to the check.