Brazil, US Identify Molecule to Help Fight Citrus Greening
Researchers have identified a molecule that attracts an insect which carries citrus greening disease.
This development is expected to help farmers control a disease that has destroyed citrus trees in areas of Brazil and the United States.
The discovery is the result of six years of research on Diaphorina citri, an insect that is the vector of citrus greening disease.
The molecule was identified by the research center Fundo de Defesa da Citricultura, or Fundecitrus. The effort was carried out in partnership with the University of California, Davis and the University of Sao Paulo's Agricultural College.
The next step will be to synthesize a chemical substance from the molecule. Then, researchers will create a product that will work as a trap to attract and stop the insect. Scientists hope to reduce the spread of citrus greening disease. The disease is blamed for the destruction of almost half of Brazil's current orange tree area since 2005.
Juliano Ayres is the general manager at Fundecitrus. He says, while these measures will not cure greening disease, in his words, "it will allow us to work in an intelligent and assertive way against the insect."
The first commercial product should be available to farmers in a year, said Walter Leal, a Brazilian researcher representing UC Davis.
Fundecitrus said Brazil's main citrus producing areas have almost 175 million trees planted on about 415,000 hectares. It is estimated that 32 million trees are infected.
There is no cure for citrus greening disease.
The United States Department of Agriculture (USDA) says it is one of the most serious citrus plant diseases in the world. Infected trees produce fruit that is green, misshapen and bitter. This makes them unsuitable for sale as fresh fruit or for juice.
The USDA says most infected trees die within a few years.
I'm Jonathan Evans.
1.carried out 实施
Forensic experts carried out a painstaking search of the debris.
2.chemical substance 化学物质
A gland is a tissue or organ that produces a useful chemical substance.
3.fresh fruit 新鲜水果
Fresh fruit and vegetables provide fibre and vitamins.
4.the general manager 总经理
The general manager may have got steamed up about nothing
5.The effort was carried out in partnership with the University of California, Davis and the University of Sao Paulo's Agricultural College.
in partnership with 与...合作
He led the research in partnership with Facebooks Data Science team.
The Alliance also supports and works in partnership with civil society groups on specific initiatives.
6.The disease is blamed for the destruction of almost half of Brazil's current orange tree area since 2005.
be blamed for 对...负责
You know perfectly well I can't be blamed for the failure of that mission.
He has already been blamed for his party's lackluster performance during the election campaign.
该结果是对柑橘木虱进行了6年的研究后才得出的 。这种昆虫是黄龙病病毒的传播媒介 。
该分子由柑橘保护基金会Fundo de Defesa da Citricultura（Fundecitrus）鉴定的 。该研究是由加州大学戴维斯分校和圣保罗大学农学院合作完成的 。
接下来就是人工合成分子中的化学物质 。然后，研究人员会制造一种产品为诱饵，吸引并拦截这种昆虫 。科学家希望能够减少柑橘黄龙病的传播 。自2005年以来，这种疾病导致巴西约一半的柑橘树遭到了破坏 。
茱莉亚诺·艾尔斯（Juliano Ayres）是柑橘保护基金会经理 。他说，虽然这些措施不能根除柑橘黄龙病，但是“可以让我们用明智且自信的方式防治这种害虫” 。
柑橘保护基金会称，巴西主要柑橘地区约41.5万公顷，柑橘树数量约1.75亿 。据估计，有3200万株柑橘树被感染 。
美国农业部表示，这种病是世界上最严重的植物病之一 。被感染的果树所结的果实为绿色、畸形且味道苦涩 。导致这些水果既无法以新鲜水果出售，也无法做成果汁 。