Impact of solarization and methyl bromide alternatives on greenhouse hot pepper production in Costa Rica

Bielinski M. Santos, James P. Gilreath, Jorge E. Mora-Bolanos, J. Arturo Solorzano-Arroyo


Greenhouse studies were conducted in La Ceiba, Alajuela, Costa Rica, to examine the effect of fumigants and solarization on soilborne pest control and 'Campana' hot pepper (Capsicum frutescens L.) marketable yield. Fumigant treatments were: a) methyl bromide plus chloropicrin (MBr + Pic 98:2 w/w) at a rate of 500 kg·ha[sup-]; b) emulsifiable concentrate of 1,3-dichloropropene (1,3-D) plus Pic at 275 L·ha[sup-]; c) emulsifiable concentrate of metam sodium (metam-Na) at 275 L·ha[sup-]; and d) non-treated control. Soil was either solarized for 8 weeks (average maximum temperature [almost equal to]60ordm;C) or not solarized. Solarization reduced the weed densities, but not rootknot nematode populations (Meloidogyne spp.). Similarly, there was no solarization effect on hot pepper yield. Among the fumigants, MBr + Pic and 1,3-D + Pic had the best performance controlling the nematode. Pepper yield in 1,3-D + Pic-treated plots was equal as with MBr + Pic, whereas there was no yield difference between metam-Na and MBr + Pic.


soil fumigant; soilborne diseases; nematodes; 1,3-dichloropropene; chloropicrin; metam sodium

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283