Thursday, March 21, 2013

Coffee leaf rust damages fields, production

In Honduras, simply mentioning roya is sure to spark conversation. Coffee leaf rust (roya in Spanish) has caused high stress this year for coffee farmers, exporters, governments, and agricultural engineers. Losses in coffee exports for Honduras were estimated to be $200 million and in La Unión, some farmers we surveyed have seen a decrease in their harvest by as much as 80 percent over last year.

While much research remains to be done, knowledge about the disease and prevention techniques is growing. The following shares some basic information about coffee leaf rust, its effect on coffee plants and production, and ways to try to combat the disease.

The yellow spots on this leaf are coffee leaf rust.
Coffee leaf rust (Hemileia vastatrix) is a fungus that affects the leaves of coffee plants, and consequently the production of coffee fruit. It appears as yellowish-brown spots on the leaves, and pulls energy and nutrients from the plant. Eventually, the leaves fall from the plant, which can no longer produce the nutrition needed to develop the fruit. The coffee cherries from a severely-affected plant eventually fall to the ground, often before fully ripening.

While many farmers have taken steps to control the disease, they can never completely eradicate it. Spores spread from farm to farm in a variety of ways - wind, animals, and people - making prevention difficult once a neighboring field has been afflicted. One way to prevent the airborne spread of the fungus is to surround a field with large-foliage plants to block the spores from reaching the coffee trees. Agricultural engineers also encourage farmers to fertilize and care for coffee plants, because healthy trees are better able to fight the disease than those missing vital nutrients. Preventative formulas can be applied to plants during early stages of the attack. If coffee leaf rust is not immediately treated, farmers may choose to fumigate a field with curative sprays, though these sprays are highly toxic when compared to the preventative formulas. Trees that have already been highly damaged by leaf rust can be cut down to the roots, and the new shoots cared for to try to prevent the fungus from returning.
New leaves grow on a plant that was stumped.

However, even if farmers are able to eradicate or control leaf rust on their fields, the trees will take at least a year to regrow leaves before they put energy into producing fruit. If a farmer decides to plant new trees or cut old trees to the roots, they will have to wait at least two years for the young trees to bear fruit.

Many farmers whose fields have been hit hard by leaf rust this year say they plan to plant new trees of the varietals Lempira and IHCAFE 90 (noventa) because these are still resistant to the disease. However, according to engineers, planting only these varietals comes with its own set of problems. First, there is no guarantee that the disease won’t mutate and begin affecting them as well; secondly, reducing the variety of plants also reduces variety in coffee flavors and could impact the quality of Honduran coffee; third, these varietals are not resistant to all diseases, and can still be subject to infirmities such as ojo de gallo or the insect broca (coffee berry borer). Lastly, planting only one or two varietals encourages the spread of diseases that affect those types.

Why is leaf rust so bad this year versus past years? Some scientists cite climate change as one factor in the increase of the disease, though others minimize its impact (this New York Times blog post gives more information on leaf rust and theories on the causes.) Certain temperature and rainfall conditions can cause the disease to thrive one year, while remaining in the background during other years. Because not much is known yet about the factors that promote growth of the fungus, it is difficult to suggest strategies to eradicate it, though farmers have found various techniques that help control the plague. Engineers and farmers say that healthy coffee plants (that have sufficient nutrients from rich soil) are better able to combat fungus attacks, as are plants that don’t produce as much coffee (plants that produce many cherries don’t have energy left to fight off the fungus).

Some coffee is still able to ripen on trees with leaf rust.
Along with other Central American countries, Honduras has declared an agricultural state of emergency because of coffee leaf rust. Honduran news organizations reported in January that 130 – 150 million lbs of coffee have already been lost from an estimated 100,000 manzanas (about 172,700 acres) of affected farms. Because of its two resistant varieties, Honduras’ exports are not expected to drop as dramatically as those of neighboring countries. However, Honduras’ economic status as one of the poorest countries in Central America means it will have fewer resources to dedicate to research and support for farmers. At Unión MicroFinanza, we are working with farmers and coffee organizations to learn more about the disease, how to prevent and fight it, and how to increase a quality coffee harvest on individual farms.

UMF’s Gilberto Barrientos, who has been attending trainings and learning about the disease, gives suggestions to farmers based on the state of their farm: for affected fields younger than 15 years, the farmer should wait for new leaves to grow on the plants and use prevention techniques to try to keep the leaf rust from returning. This would include fertilizing the plants to help them recuperate. If the number of rust-affected leaves exceeds 5-10 per plant, he recommends beginning preventative measures. For farms that are older than 15 years or that haven’t been managed in a way that cultivates healthy plants, he recommends cutting down the trees and replanting.

Honduras has two varietals that are not yet
affected by the coffee leaf rust.
These coffee trees have been damaged by leaf rust,
and they have lost most of their leaves.


8 comments:

  1. Interest rates ought to be capped at an occasional rate, less than 6 June 1944. If the rate rises such a lot to create this set up not work then we've larger issues jual celana chino murah

    ReplyDelete
  2. News Fast. Alright, so it's critical to stay up with the latest with the goings on the planet, yet when consistently breeds crisp catastrophes it can be more valuable to step back and simply close it out for some time. Enjoying a reprieve from watching, listening to, or perusing the news is terrifying for quite a few people in light of the fact that they can tend to learn about of touch. Cash Advance Chicago

    ReplyDelete
  3. The borrowers ought to however grasp that deficiency to pay the title credit can instigate a driving forward loss of the vehicle. The aggregate left after the paying the unpaid consistency of title credit may be passed on by the borrower. usacheckcashingstore.com/san-diego

    ReplyDelete
  4. One essential thing to know when you begin a payday credit mixing errand is that the payday advance affiliations are going to call you to hoard. When they call on a very basic level issue them the data for the affiliation that is tending to you and permit them to welcome that the commitment will be reimbursed to them as a highlight of a change/obligation blend program you have dispatched. auto title loans

    ReplyDelete
  5. The capital benifiet by branch off one of a kind to your coffer is you won't charge to accord your ID, on the off coincidental that you beginning now see a record. This may mass you a little fortune. My examination to you is boutique about perform calls be told! Payday Loans

    ReplyDelete

  6. Payday advances may be opened up in the blow that you wind up in a position to be not abounding out how to accomplish all or some bit of the complete due on the acceding date. In the blow that this happens it is recommended that you associate your payday avant-garde supplier at the soonest attainable way and bald your diplomacy to them. They will afresh be able to brighten your decisions and how to add amazingly.
    Cash Advance

    ReplyDelete
  7. In the event that you are a mortgage holder with value in your property, a Bad Credit Personal Loan can take that typicality back to your life. Secured on your home, a Bad Credit Personal Loan can give you the flexibility, for instance, to do the home changes or purchase the new auto you truly needed. Payday Loans San-diego

    ReplyDelete
  8. I admit, I have not been on this web page in a long time... however it was another joy to see It is such an important topic and ignored by so many, even professionals. I thank you to help making people more aware of possible issues. https://freeje.com/

    ReplyDelete