Monday, November 18, 2019

Tomato and Pepper import retrictions.


FOR INFORMATION AND ACTION
DA-2019-28
November 15, 2019


Subject:    Federal Order for U.S. Imports of tomato (Solanum lycopersicum) and pepper (Capsicum spp.) hosts of Tomato brown rugose fruit virus (ToBRFV)

To:            State and Territory Agricultural Regulatory Officials

Effective November 22, 2019, after issuance of this notice, the USDA’s Animal and Plant Health Inspection Service (APHIS) will restrict the importation of tomato (Solanum lycopersicum) and pepper (Capsicum spp.) hosts of Tomato brown rugose fruit virus (ToBRFV). APHIS has determined it is necessary to restrict the importation of these plant species to prevent the introduction of ToBRFV into the United States.

ToBRFV is a recently described member of the Tobamovirus genus. This virus genus also contains other economically important pathogens that infect vegetable crops, including Tobacco mosaic virus (TMV), Tomato mosaic virus (ToMV), and Cucumber green mottle mosaic virus (CGMMV). The disease caused by ToBRFV was first reported in 2014 in tomatoes in Israel. Since then, ToBRFV has been reported in China, Mexico, Germany (eradicated), Italy, Jordan, Turkey, Greece, the United Kingdom, and the Netherlands. Given the global nature of seed production and the international movement of seeds, the distribution may be greater than reported.

Tomato and pepper are the two main hosts. Symptoms caused by ToBRFV include bubbling and mosaic on leaves of susceptible pepper, and fern leaf and mosaic on tomato leaves. On fruit, symptoms include smaller fruit size with a rough surface, fruit drop, delay in ripening, and fruit discoloration including blotching, pale color and/or brown necrotic spots. Infected tomato fruits can be unmarketable or reduced in quality. Necrosis can occur on susceptible pepper fruit.

Tobamoviruses are mechanically transmitted and seedborne viruses. ToBRFV is mechanically transmissible through infected sap of both tomato and pepper. Transmission occurs through touching and manipulating infected plants. Transmission is common during transplant productions or in crop production systems in which plants are regularly handled, such as greenhouse operations.

To safeguard against the introduction of ToBRFV into the United States, APHIS is restricting the importation of tomato and pepper by requiring imported plants and plant products to be free of evidence of ToBRFV, as specified in the attached Federal Order. Currently, propagative hosts are considered high risk pathways for the introduction of ToBRFV and under the conditions of the Federal Order, imports of propagative material must be free from ToBRFV based on origin from an area where the pest is absent or based on negative results of diagnostic testing.

APHIS is placing restrictions on imports of fresh tomato and pepper fruit from those countries where ToBRFV is present and that are approved to export to the United States. Although the phytosanitary risk associated with infected fruit is historically considered to be low, in light of reports of the transmission of the virus from fruit, these interim measures are necessary to safeguard U.S. tomato and pepper production while APHIS fully evaluates emerging scientific evidence on ToBRFV. Specifically, APHIS will require tomato and pepper fruit imported from Mexico, Israel, and the Netherlands (countries approved to export tomatoes where ToBRFV is present) to be inspected at the point of origin to ensure it is free of disease symptoms. Because Canada imports tomato and pepper fruit from Mexico that are re-exported to this country, APHIS will also require tomato and pepper fruit from Canada to be inspected at the point of origin to ensure it is free of disease symptoms. In addition, U.S. Customs and Border Protection (CBP) will increase inspections at U.S. ports of entry to ensure imported tomato and pepper fruit entering from Mexico, Israel, the Netherlands, and Canada do not show any signs of disease upon arrival.

We will also restrict importation of tomato and pepper fruit worldwide to commercial consignments only and prohibit imports in passenger baggage.

These requirements for imported fruit will remain in place until APHIS completes its risk analysis of the fruit pathway for ToBRFV introduction into the United States and determines appropriate regulatory action.

For additional information regarding this Federal Import Order, please contact Dr. Angela McMellen-Brannigan at 301-851-2314 or Angela.McMellen-Brannigan@usda.gov.


Monday, November 11, 2019

Pecan Stick Tights




WHY DO I HAVE STICK TIGHT WITH MY PECANS?

Each pecan season is different; a friend of mine told me he had been farming in Eddy County for more the 60 years and that it would be easier if there was two years the same so he would know what to do.  This year is not the same as any other year except I have received calls from all over Eddy, Lea and Chaves counties asking about pecans still in the shuck or stick tights and it is all the nuts on the whole tree. In the other articles I’ve written on this subject is was not all the nuts on a tree and when you cut open the nuts that were stick tight they were less mature and not as filled as the non-stick tight nuts on the same tree.   This year is different because the black shriveled shuck is around every nut on the tree and when you cut them open they are filled and fairly mature.  The varieties that mature earlier, like Pawnee are open and dropping nuts and later maturing varieties are having stick tights.  That is my observation in my orchard and I have a number of varieties that are all fertilized and watered the same.   The shuck split occurs with the production of ethylene, which is the same natural chemical that turns tomatoes and chilis red and bananas brown. I have taken a few pecans and put them in a paper sack with a few green bananas and in a few days the shucks open up.  Pecan produces ethylene when the nuts are completely filled in the kernels as the nuts mature. However, as I said every year is different.  Reading articles in Pecan South and Georgia Pecan there is a lot we just don’t understand yet in pecan physiology, but we are working on it.   Dr. Heerema and New Mexico State University Plant Pathology has recently confirmed bacterial leaf scorch in pecans and this has been associated with stick tights because of reduced water movement in pecans.  There are numerous articles on drought induced pecan stick tights.   

If the nuts are filled and shuck still stick tight you may have 2nd or 3rd pecan nut case bearer larva between the shuck and the nut.  As they feed they cut the pipes that deliver nutrients to the shuck and nut.  This prevents the water pressure from opening the shuck or interferes with the production of ethylene. 

If there are lots of black on the shuck and on the nut shell this can be from the case bearer or more than likely from stink bug damage.   Again this is a result of broken pipes and loss of pressure to open the shuck or some interference in the production of ethylene. 

Then there is stick tights that occur when under hot dry wind in late July early August during the water filling stage of the nut, trees do not receive enough water to fill the nut.  Often stick tights are associated with an “on” year when there are lots of nuts and therefore lots of demand for water.    Physiological drought in pecans can occur even when the producer applies sufficient water to the soil.   So if as a home owner you put your pecan in a bag with bananas and they still do not open, it was one of those other causes, and what was the cause this year; but may not be there next year.   This year my personal thought as a grower, because it is so wide spread in the valley and early maturing varieties that have a much lower occurrence in this weather.  This year we had an early hard freeze. We normally get a light freeze 30-32 F the first week of November but this year we had a hard killing freeze below 28F the first week of November, which breaks the pipes as the insects do and breaks cell walls so ethylene is released or not produced.  As we know a number of things can cause or work together to create similar symptoms.  This is my thought on the stick tights this year, which is different from what I had for last year.    Dr. Heerema told me, “At this point though, I’m still hopeful that as the shucks dry down they still might pop open.  One grower I talked with on Friday said that exactly that was happening.”     

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