Uptake and fate of triticonazole applied as seed treatment to spring wheat (Triticum aestivumL.)

Abstract

Following seed treatment of wheat (T riticum aestivum L.) with 14Clabelled triticonazole at a dose of 1É8 g kg~1 seed, the uptake of radioactivity by shoots and roots was investigated from the two-to three-leaf stage up to the beginning of the booting phase, 80 days after sowing. Triticonazole equivalents taken up by wheat plants reached 5É7% and 14É6% of the applied dose in the shoots and the roots, respectively. Between the two-to three-leaf stage and the beginning of the booting phase, the concentration of triticonazole equivalents in the shoots decreased from 2É5 to 0É15 lg g~1 fresh weight. This was attributed to uptake of triticonazole by roots not keeping pace with shoot growth and increased retention in the roots of triticonazole taken up. The main factor limiting the uptake of triticonazole by the roots may be the rapid growth of the uptake-active apical root parts out of the dressing zone which had formed in the soil. Distribution of triticonazole equivalents taken up by the main shoot showed a decreasing concentration gradient from the oldest to the youngest leaf. An increase in the seed treatment dose was investigated as a way to increase the concentration of triticonazole in the shoots, but its inÑuence remained limited.1998 SCI ( Pestic. Sci., 53, 324È332 (1998)

Systemic Seed Treatment Uptake during Imbibition by Corn and Soybean

“…The bars represent ±SE from four replicates. When the fungicide triticonazole was applied as a seed treatment to spring wheat (Triticum aestivum L.), the calculated amount absorbed by the caryopsis was linearly correlated to the applied rate in the range of 0.45 to 2.4 g kg −1 seed (Quérou et al, 1998). 1) and soybean (Fig.…”

“…For example, the uptake of herbicides (linuron, chlorpropham, atrazine, EPTC, and amiben) by soybean seeds was directly proportional to concentration of soaking solution in the range of 0.02 to 0.32 mM (Rieder et al, 1970). When the fungicide triticonazole was applied as a seed treatment to spring wheat (Triticum aestivum L.), the calculated amount absorbed by the caryopsis was linearly correlated to the applied rate in the range of 0.45 to 2.4 g kg −1 seed (Quérou et al, 1998). In our study, corn OH7B and three tested soybean cultivars also presented a linear relationship between seed uptake and applied dosage in the range of 0.01 to 0.5 mg g −1 seed with r 2 > 0.93.…”

“…For example, systemic neonicotinoid seed treatment insecticides are used worldwide to control foliar pests (Douglas and Tooker, 2015). seeds was investigated over a 16-fold range (Rieder et al, 1970), and the fungicide triticonazole was tested over a 5.3-fold range (Quérou et al, 1998). There are few reports on the uptake of agrochemicals applied as seed treatments and generally under limited dosages that are used for pest management.…”

“…For example, the uptake of selected herbicides by soybean [Glycine max (L.) Merr.] seeds was investigated over a 16-fold range (Rieder et al, 1970), and the fungicide triticonazole was tested over a 5.3-fold range (Quérou et al, 1998). The focus of the current study is on the uptake of a systemic compound into soybean and corn (Zea mays L.) seeds during imbibition over a much larger 2000-fold range, so our results have broad application for understanding commercial seed treatment uptake.…”

Triticonazole enantiomers: Separation by supercritical fluid chromatography and the effect of the chromatographic conditions

“…Triticonazole [( RS )‐5‐(4‐chlorobenzylidene)‐2,2‐dimethyl‐1‐(1 H ‐1,2,4‐triazol‐1‐ylmethyl)‐cyclopentanol] is a kind of triazole fungicide that contains an asymmetrically substituted carbon atom and has two enantiomers. It has showed high activity against funguses through inhibiting the synthesis of enzymes, and been widely applied in the prophylaxis and therapy of powdery mildew, crops of sheath blight disease, and so on . Usually, plant treatment is performed with the racemic mixture.…”