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http://dx.doi.org/10.5423/PPJ.2002.18.3.142

Effect of Potassium Phosphonate on the Control of Phytophthora Root Rot of Lettuce in Hydroponics  

Jee, Hyeong-Jin (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Adminstration)
Cho, Weon-Dae (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Adminstration)
Kim, Choong-Hoe (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Adminstration)
Publication Information
The Plant Pathology Journal / v.18, no.3, 2002 , pp. 142-146 More about this Journal
Abstract
The effect of potassium phosphonate ($KH_2PO_3 or $K_2 HPO_3$) on the control of Phytophthora root rot of lettuce was evaluated in a liquid hydroponic culture. Phosphonate 100 ppm strongly inhibited mycelial growth of Phytophthora species in vitro but did not affect normal growth of lettuce in a greenhouse test. Application of the chemical before infection showed over 94% control value, while it was less than 35% when applied after infection. In a field trial, phosphonate 100 ppm, which was directly supplemented into the nutrient solution, satisfactorily controlled the disease as it did not develop until 28 days after transplanting and remained at less than 2% infection rate at the end of cultivation. Meanwhile, in the control plot, the disease initiated at 7 days after transplanting and developed rapidly reaching over 70% infection rate at 28 days. Population density of the causal pathogen, R drechsleri, in a heavily infested farm was 22.0-25.0 cfu/100 ml of nutrient solution. However, it decreased to 1.3-2.0 cfu/100 ml at 7 days after treatment with phosphonate 200 ppm.
Keywords
control; hydroponics; lettuce; phosphonate; Phytophthora root rot;
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1 Dunhill, R. H. 1990. The manufacture and properties of phospho-nic (Phosphorous) acid. Austral. Plant Pathol. 19:138-139   DOI
2 Guest, D. I. and Grant, B. R. 1991. The complex action of phos-phonates as antifungal agents. Biol. Rev. 66:159-187   DOI
3 Guest, D. L., Pegg, K. G. and Whiley, A. W. 1995. Control of Phytophthora diseases of tree crops using trunk-injected phos-phonates. HorticuIturat Rev. 17:299-330
4 Jee, H. J., Cho, W. D. and Kim, C. H. 2000. Phytophthora Diseases in Korea. National Institute of Agricultural Science and Technology, Rural Development Administration, Suwon 441-707, Korea. 226 p
5 Ouimette, D. G. and Coffey, M. D. 1989b. Comparative antifun-gal activity of four phosphorate compounds against isolates on nine Phytophthora species. Phytopathology 79:761-767   DOI
6 Jee, H. J., Nam, K. W. and Cho, W. D. 2001. Severe root rot on hydroponically-grown lettuce caused 3y Phytophthora drech-sleri. Plant Pathol. J. 17(5):311-314
7 Fenn, M. E. and CofFey, M. D. 1984. Studies on the in vitro and in vivo antifungal activity of fosetyl-Al and phosphorous acid. Phytopathology 74:606-611   DOI
8 Smillie, R., Grant, B. R. and Guest, D. 1989. The mode of action of phosphite: Evidence for both direct and indirect modes of action on three Phytophthora spp. in plants. Phytopathology 79:921-926   DOI
9 Ouimette, D. G. and Coffey, M. D. 1989a. Phosphonate levels in avocado seedlings and soil following treatment with fosetyl-Al or potassium phosphorate. Plant Dis. 73:212-215   DOI
10 Stanghellini, M. E. and Rasmussen, S. L. 1994. Hydroponics: a solution for zoosporic pathogens. Plant Dis. 78:1129-1138   DOI   ScienceOn
11 Jackson, T. J., Burgess, T., Colquhoun, I. and Hardy, G. E. SU. 2000. Action of the fungicide phosphite on Eucatyptus margi-nata inoculated with Phytophthora cinnamomi. Plant Pathol-ogy 49:147-154   DOI   ScienceOn
12 Forster, H., Adaskaveg, J. E., Kim, D. H. and Stanghellini, M. E. 1998. EfIect of phosphite on tomato and pepper plants on sus-ceptibility of pepper to Phytophthora root rot and crown rot in hydroponic culture. Plant Dis. 82:1165-170   DOI   ScienceOn