The medication time of using forchlorfenuron to enlarge grape fruit are all in young fruit period, after medication, the grape fruit at least need more than 60 days to mature, according to the study, the Forchlorfenuron is low toxicity, preparation is slightly toxic, ripe grapes fruit would not remain forchlorfenuron.
From the analysis of residues and toxicity two aspects, grapes using Forchlorfenuron is very safe. Main reasons: (1) Forchlorfenuron as a plant exogenous hormones, on plant physiology has a huge effect, but no physiological activity to the animal body, that plant hormones would not produce physiological effects to human body such as precocious puberty. (2) Forchlorfenuron itself is an organic compound, after involved in grapes physical activity will digested soon, in the soil environment is also no residue. This means that people eat grapes would not eat it. (3) Forchlorfenuron only to the grapes young organizations have the role of promoting cell division, grape actual production use only in the young fruit, will not use in the middle and late period of grades, because the application is not valid in the middle and late period. (4) an effective amount of plant exogenous hormones is extremely small, the actual concentration used mostly in the 2-5mg/L, maximum is not more than 10%. Generally per acre use the prepared liquid drug about 20L, ie up to 200 mg/mu of the original dose. (5) Although there are some people in the actual production abuse forchlorfenuron (refer to broaden the scope of use), but never uncontrolled used high concentrations. Because the concentrations exceed 10mg/L often cause the grapes quality reduced, stems hardening, thickening, distorting, deformity; if exceed 30mg/L, a huge hormonal responses and negative effect will cause the fruit serious deterioration and lose value, it’s like people or animal hormones, a diabetic person will not be free to increase the amount of insulin injections.
Since the recent period, the management of watermelon “swelling agent” was questioned by society, and some even questioned why only agricultural plant protection experts come forward, rather than the medical and public health experts explain? In fact, this is misleading. A kind of pesticide, whether be allowed production and use, we must first obtain the Ministry of Agriculture pesticide registration. Registration review is very strict, should go through the product chemistry, efficacy, toxicology, residues, environmental impact, labels and other aspects of the evaluation experts. In approving the registration of pesticides, pesticide labels required a complete and correct content, including generic name, trade name, active ingredient and content, formulation, shelf life, product usage, dosage, uses and safe interval, etc., also needs to have an pesticide registration number, production approval document and product quality standards number.
Forchlorfenuron, gibberellic acid is the pesticides that Chinese Ministry of Agriculture allows used in the production of grape varieties, has registered a lot of products, such as Shanghai’s thirty-six card “75% gibberellic acid crystalline powder”, “Sichuan 0.1% Forchlorfenuron” belong to label specifications, card number is complete, is approved by the authorities, you can trustingly use. Of course, there also have fake, but after all, there are not the main products. For example, Shanghai Agriculture Committee recently check the Shanghai market plant preparations, the result is 98% qualified products.
Not only China allows forchlorfenuron use in the grape, in the United States, Japan and other countries also approved to use. U.S. EPA in 2004 released Forchlorfenuron as a new plant growth regulator is registered in using on grapes and kiwi. Japan in 2005 released the new version of the pesticide information, Forchlorfenuron permit applied once on grape, the maximum use concentration limit is10mg/L.
Source:http://www.cospcn.com