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Effects of Cinnamaldehyde Formulation and Its Application Methods and Dosages on Controlling Tomato Root Galling Caused by Meloidogyne incognita
Fig. 1. Effects of 36% cinnamaldehyde granule broadcast on medium surface on root growth of tomatoes. (A) Control, no application, (B) application of 50 mg pot<sup>-1</sup>, (C) application of 100 mg pot<sup>-1</sup>, and (D) application of 200 mg pot<sup>-1</sup>. The white bar represents 2 cm.
Fig. 1. Effects of 36% cinnamaldehyde granule broadcast on medium surface on root growth of tomatoes. (A) Control, no application, (B) application of 50 mg pot-1, (C) application of 100 mg pot-1, and (D) application of 200 mg pot-1. The white bar represents 2 cm.

Author:Jiunn-Feng Su、Ling-Yen Li、Lan-Yi Chien、Ting-Fang Hsieh*

Abstract:

The effects of a 36% cinnamaldehyde microemulsion (Plant Protection Registration No. 00823; trade name Black Asura MC) and its derived granules on root-knot formation caused by the southern root-knot nematode (Meloidogyne incognita) on tomato roots were evaluated under pot conditions. The microemulsion was first applied to tomato plants 7 d prior to nematode inoculation, and rootknot formation was assessed 5 wk after inoculation. Across two repeated trials, reductions in rootknot incidence were achieved when the microemulsion was drenched at a 5,000-fold dilution, with the rate of galling decreased from 100% and 69.7% to 50.8% and 30.5%, respectively. The root-knot index (0–4) decreased from 4.0 to 3.4 and from 4.0 to 2.3, respectively, indicating a stable inhibitory effect. When the microemulsion was applied 7 d after nematode inoculation, suppression of the rootknot galling rate was not effective. The influence of application methods of the cinnamaldehyde granules on tomato root-knot development was also assessed. When the granules were mixed with half of the growth substrate, in the first trial, treatment with 100 mg pot-1 reduced the galling rate from 60.8% to 39.4% and decreased the gall index from 3.8 to 2.8, showing the best effect. In the second trial, treatment with 200 mg pot-1 reduced the galling rate from 82.0% to 53.6% and decreased the gall index from 4.0 to 3.6, showing the best effect. When different application methods were compared, significant reductions in both the root-knot rate galling rate and the root-knot index were achieved with surface spreading at 50, 100, and 200 mg pot-1. In contrast, the uniformly mixed treatments exhibited a limited suppressive effect, and mixing at 200 mg pot-1 resulted in obvious inhibition of root development.

Key words:Cinnamaldehyde microemulsion, Cinnamaldehyde granules, Southern root-knot nematode, Root-knot index

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Journal of
Taiwan Agricultural Research
Vol. 75, No.3 (2026) ISSN: 2790-086X Vol. 75, No.3 (2026)
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