Tomato plants (six- to seven-leaf stage) sprayed with the nonprotein amino acid DL-3-amino-n-butanoic acid (DL-β-amino-n-butanoic acid) were protected against a challenge infection with Phytophthora infestans. A single foliar spray (19.4 mM, 2,000 ppm) applied either before or after inoculation provided more than 95% control of the disease compared with unsprayed challenged plants. The concentration of the racemate required to achieve 50% control of the disease was 175 ppm (1.7 mM). DL-2-Amino-n-butanoic acid was half as effective compared with the DL-3-amino-n-butanoic acid, whereas the 4-amino-n-butanoic acid was ineffective against the blight [...]
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Yigal Cohen (1994) studied this question.