Effect of short-term growth of mung bean and its soil incorporation on the density of the soybean cyst nematode, Heterodera glycines, in pot experiments

Abstract

We previously reported that incorporation of bean sprout residue into soil stimulated hatching of the soybean cyst nematode (SCN), Heterodera glycines. The objective of this study was to evaluate the effects of short-term growth of mung bean (Vigna radiata), the raw material of bean sprout, and its incorporation into the soil on the density of SCN in soil. When mung bean was grown in pots for 2 and 4 weeks in a SCN-infested andosol, incorporated into the soil and further incubated for 2 weeks, the SCN density decreased markedly. Mung bean was also grown in pots under different moisture conditions. The SCN density decreased in the soils with 48-68 g water, but not with 39 g water (100 g dry soil)−1 in which mung bean grew the poorest. The present study suggests that short-term growth of mung bean may be useful to decrease the density of SCN in soil.

Suppression of the soybean cyst nematode, Heterodera glycines, by short-term field cultivation and soil incorporation of mung bean

“…We previously reported that short-term growth and incorporation of mung bean in pots stimulated SCN hatching and then decreased SCN density (Chikamatsu et al, 2017).…”

“…This study was conducted to show whether short-term cultivation of mung bean and its ploughing in fields decreased the population density of SCN in the soil. Two climatic factors are mainly involved in the efficacy to decrease SCN density: temperature and moisture (Chikamatsu et al, 2017). In previous studies, different optimal temperatures were reported for SCN hatching.…”

“…In a field covered with plastic film (5 m × 50 m) in Saitama Prefecture, we conducted the following experiment consisting of five treatments: 1, control (no mung bean and no irrigation); 2, MB9 (sowing rate of mung bean was 9 g m -2 , an amount recommended by Chikamatsu et al (2017), and irrigation was done only at sowing); 3, MB9i (sowing rate, 9 g m -2 and irrigation was done both at sowing and ploughing); 4, MB18i (sowing rate, 18 g m -2 and two times irrigation); and 5, MB27i (sowing rate, 27 g m -2 and two times irrigation). The treatment size of control and MB9 were each 25 m 2 (5 m × 5 m), and MB9i, MB18i and MB27i were each 65 m 2 (13 m × 5 m).…”

“…In Japan, SCN mainly causes yield losses of soybean and green soybean, which is immature soybean. The damage has spread not only in Hokkaido (Aiba, 2001), which is the main prefecture for soybean production, but also in urban areas such as Chiba and Saitama (Chikamatsu et al, 2017), which are the main prefectures for green soybean production.…”

“…The benefit of mung bean growth and its incorporation requires only a short-term growth period, while other green manures require more than 1 month (Wen et al, 2017;Acharya et al, 2019;Kushida et al, 2002Kushida et al, , 2003. By this process, hatch of J2 was stimulated and SCN density was decreased (Chikamatsu et al, 2017). All these experiments were done in pots.…”