Objectives

A field trial was carried out in Kashmir valley to determine the persistence of fenazaquin 10EC (Magister) in Red Delicious variety of apple at recommended (0.004%) and double the recommended (0.008%) application rates.

Methods

The spray was conducted one month prior to harvest. The plants treated with simple tap water were treated as control. Samples were collected at 0, 3, 7, 10, 15, 20 days and harvest. The procedure followed for extraction and cleanup was that of Luke et al. (1985) modified by Sharma (2007) and the final analysis was carried out on a Varian 450 (Walnut Creek, CA, USA) gas chromatograph (GLC) equipped with Thermionic Specific detector (TSD).

Results

After computation of data, the initial deposit was recorded as 3.18 ± 0.03 μg g − 1 and 6.98 ± 0.08 μg g − 1 at two concentrations, respectively. Fenazaquin (0.004%) dissipated to 96.91 per cent in 20 days after application and was not detectable beyond this period. Fenazaquin (0.008%) however, persisted upto 30 days recording 95.84 per cent dissipation at that time.

Conclusions

The progressive dissipation of fenazaquin (0.004%) and fenazaquin (0.008%) residues down to their tolerance limits suggested a waiting period of 18.55 and 30.49 days with a half-life period of 3.62 and 4.12 days, respectively. The terminal residue of fenazaquin at the lower rate was below maximum residue limit (MRL) set by European Union, however above MRL at the higher rate.

中文翻译：

---

苹果果实和土壤中非那西喹（10EC）的残留残留量

目标

在克什米尔河谷进行了田间试验，以确定推荐使用（0.004％）和推荐使用率（0.008％）的两倍的情况下，法尼扎喹10EC（Magister）在红色美味苹果中的持久性。

方法

收获前一个月进行喷雾。用简单自来水处理过的植物作为对照。在0、3、7、10、15、20天收集样品并收获。提取和纯化所遵循的程序是Luke等人的程序。（1985）由Sharma（2007）修改，最终分析是在配备有热电子特异性检测器（TSD）的Varian 450（Walnut Creek，CA，USA）气相色谱仪（GLC）上进行的。

结果

在计算数据之后，两种浓度下的初始沉积分别记录为3.18±0.03μgg-1和6.98±0.08μgg-1。Fenazaquin（0.004％）在应用后的20天内消散至96.91％，在此之后无法检测到。然而，Fenazaquin（0.008％）持续长达30天，当时的耗散率为95.84％。

结论

降低了头孢扎西残留量（0.004％）和头孢扎喹（0.008％）的残留，直至其耐受极限，提示等待时间为18.55天和30.49天，半衰期分别为3.62天和4.12天。Fenazaquin的末端残留率较低，低于欧盟设定的最大残留限量（MRL），而较高比率则高于MRL。