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Pencycuron

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(CAS#: 66063-05-6)

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Chemical Name: N-[(4-chlorophenyl)methyl]-N-cyclopentyl-N ' -phenylurea

Structure:

Solubility:

0.3mg/l in water, 200-500g/l in dichloromethane, 2-5g/l in isopropylalcohol, 20-50g/l in toluene, 0.1-1.0g/l in hexane

Vapor pressure:

>10-5mPa at 20ˇăC, 2.5mPa at 100ˇăC

Pencycuron Application to Flooded Tropical Soils with or without Cow Manure: Degradation and Effect on Microbiological Parameters.

Laboratory study was conducted to follow the degradation and effect of pencycuron on microbial parameters of flooded alluvial (AL) soil (Typic udifluvent) and Coastal Saline (CS) soil (Typic endoaquept) under rice cultivation. Pencycuron degraded faster in CS soil and in soil amended with Decomposed Cow Manure (DCM). Pencycuron at field rate (FR), 2FR and 10FR affected the Microbial Biomass C (MBC), soil ergosterol content and Fluorescein Diacetate Hydrolyzing Activity (FDHA) differentially. The DCM amendment did not seem to have any counteractive effect on the toxicity of pencycuron on the microbial variables. The change in microbial metabolic quotient (qCO2) and microbial respiration quotient (QR), indicated that pencycuron induced disturbance at 10FR. Pencycuron was more toxic to the metabolically activated and newly generated soil microbial populations.

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Role of pencycuron in aflatoxin production and cotton seed protection.

The research is conducted on the effect of pencycuron and pencycuron-c on cotton seed mycoflora, aflatoxin production and viability. At 8% seed moisture content (mc), pencycuron and pencycuron-c promoted Aspergillus niger, A. flavus, and Penicillium corylophilum growth count at 1 g/kg, but exerted inhibitory effect at 3 and 5 g/kg. At 15% mc, pencycuron enhanced seed-borne fungi at all three doses after most treatment periods (1, 2, 3, 4, and 5 months), whereas pencycuron-c induced inhibition effect. The A. niger utilized pencycuron as nitrogen source more than pencycuron-c. Seeds with 15% mc lost their viability faster than that at 8%, and this was more evident as storage time increased. Such loss occurred faster when seed was treated with pencycuron, whereas pencycuron-c exerted significant activation in the viability compared to the control. The fungal species have high biodegradation activity and produce aflatoxin in different parts of cotton boll (fiber, valves, and seeds). Pencycuron and pencycuron-c inhibited aflatoxin B1 and B2 production in seeds, but did not affect aflatoxin G1 and G2.