Persistence of Azoxystrobin in/on Grapes and Soil in Different Grapes Growing Areas of India

Persistence of azoxystrobin was studied in/on grapes when applied @ 150 g ai ha−1 (recommended dose) and 300 g ai ha−1 (double the recommended dose) in three grapes growing states of India, namely Karnataka, Maharashtra and Tamil Nadu, in the year 2006–2007. A total of five sprays were given at an interval of about 15 days. Grapes and soil samples were collected after 5th spray, extracted and analysed by gas chromatography using electron capture detector. Half life of azoxystrobin on grapes varied from 5.4 to 11.2 days. Residues of azoxystrobin were much below the prescribed MRL (0.5 mg kg−1) after 21 days. The dissipation of azoxystrobin in soil followed first order rate kinetics with an average half life of 8.1 days at the recommended dose of application

Condensation of benzotriazole with O-alkyl P-(dichloromethyl) chlorophosphonate : Some unusual observations

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Synthesis of 4'-(2,6,6-Trimethyl-2-Cyclohexen-1-yl)-3'-Buten- 2'-Ketoxime-N-O-Alkyl Ethers

molecule

Fungal metabolites from <i>Aspergillus niger </i>AN27 related to plant growth promotion

84-87Two metabolites have been isolated from Aspergillus niger AN27, a biocontrol agent, and identified as 2-carboxymethyl 3-n-hexyl maleic acid (compound 1) and 2-methylene-3-hexylbutanedioic acid (compound 2). Their biological activities related to crop growth promotion have been assayed. Both the compounds increased germination and improved crop vigour. Compound 1 was more effective for increase in germination and shoot length,whereas compound 2 had relatively greater role in increasing the root length and biomass of cauliflower seedlings

Biodegradation of α and β isomers of endosulphan and endosulphan sulphate in Indian soils

The degradation of α and β isomers of endosulphan and endosulphan sulphate in four sterilized and non sterilized Indian soils under laboratory conditions was studied. Degradation was found to be more in non-sterilized as compared to the sterilized soil. The half life of α-endosulphan, β-endosulphan and endosulphan sulphate was found to be 136.8, 273 and 301 days in sterilized Alfisol and 55, 256 and 277 days in non-sterilized Alfisol, respectively. α-Endosulphan degraded more readily than β-endosulphan and endosulphan sulphate under both sterilized and non-sterilized soil conditions

Not Available

Not AvailableChlorimuron-ethyl, ethyl-2-(4-chloro-6-methoxy pyrimidine-2-yl-carbamoyl sulfonyl) benzoate, is a post emergence herbicide for the control of important broad-leaf weeds in soybean and maize. Though it is degraded in the agricultural environment primarily via pH-and temperature-dependent chemical hydrolysis, photolysis has also important role to degrade this compound. In this present study, the sensitizing and stabilizing effect of some organic compounds on the photolysis of chlorimuron have been investigated. The calculated half-lives of chlorimuron ethyl in presence of humic acid were 5.11 h in pyrex and 7.53 min in quartz under UV-light, and 5.78 day in quartz under sunlight, which are similar to the half-lives found in distilled water. This indicates that humic acid has no effect on the photolysis of chlorimuron in water. In another experiment, it was observed that 98 % chlorimuron was recovered in the presence of rotenone after 5 h of irradiation in pyrex tube, whereas in presence of riboflavin and benzophenone the degradation was 40.86 and 35.0%, respectively, as compared to 41.33% degradation of chlorimuron without any sensitizer. In presence of nicotine and acetone, the half-lives were 12.32 and 4.58 d, respectively, as compared to that of chlorimuron having no sensitizers in the solution (5.99 d). Thus, riboflavin and benzophenone enhance the rate of photolysis of chlorimuron whereas nicotine and rotenone significantly retard.Not Availabl

Synthesis of some 3-(5-chloro-1,3-diaryl-1<i style="">H</i>-pyrazol-4-yl)-1-arylprop-2-en-1-ones and 1,5-bis(5-chloro-1,3-diaryl-1<i style="">H</i>-pyrazol-4-yl)pent-1,4-diene-3-ones and their antimicrobial activity

1524-1531New 3-(5-chloro-1,3-diaryl-1H-pyrazol-4-yl)-1-arylprop-2-en-1-ones (4a-n) and 1,5-bis(5-chloro-1,3-diaryl-1H-pyrazol-4-yl)pent-1,4-diene-3-ones (4o-r) have been synthesized by using aryl-5-chloro-4-formyl-1,2-pyrazoles (2a-d) as key intermediate, prepared by Vilsmeir-Haack reaction of pyrazolones. The compounds have been screened against multihost plant pathogenic fungi Macrophomina phaseolina and Sclerotium rolfsii and human pathogenic bacteria MTCCB 96 Staphylococcus aureus, MTCCB 1610 Escherichia coli, clinical isolate Citrobacter Sp. and Enterococcus faecium. Some compounds have shown promising activity against these microbes. Regression analysis has also been done for relationship between antifungal activity and concentra­tion of compounds

Persistence of α and β isomers of endosulphan and endosulphan sulphate in diverse soils of India as influenced by flooding

Laboratory studies were undertaken to evaluate the persistence of α-endosulphan, β-endosulphan and endosulphan sulphate in four diverse soils under non-flooded and flooded conditions. Significant variations were observed in the extent of persistence of the three chemicals in different non-flooded soils with maximum persistence observed in Alfisol and the least in Mollisol having near neutral pH and higher organic matter. Degradation was more in all the flooded soils than in the non-flooded counterpart but in Vertisol under flooded and non-flooded conditions, the rate of degradation of endosulphan sulphate was found to be nearly same