Missouri State University
What's happening in the field?
At the Missouri State Fruit Experiment Station

Botrytis it is

We placed a sample of the blossom blight symptom collected from the high tunnel raspberries on July 15th in a plastic bag with a moist paper towel in it. Today we saw the grayish mycelium or fungal strands indicating the blight is caused by Botrytis or gray mold. This is the first time we have seen this problem in the high tunnel, but weather had been wet and overcast and we put shadecloth (47%) on the tunnel in early July which may have helped create conditions favoring Botrytis development. We will add Elevate,  a botrycide, to the spray for SWD and hope to solve this problem.

Botrytis gray mold grew on the blighted blossom when placed on a moist paper towel and sealed in a plastic  bag.
Botrytis gray mold grew on the blighted blossom when placed on a moist paper towel and sealed in a plastic bag.
Here is a closeup of the Botrytis mycelium.
Here is a closeup of the Botrytis mycelium.
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Grape phenology and GDD accumulation

GDD base 50 accumulation count beginning April 1 = 1765  http://agebb.missouri.edu/weather/reports/gddTable.asp
Phenology stages according to the Modified E-L system http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf

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Blossom blight symptom in raspberries

We noted a blossom blight symptom in the raspberries that we suspect to be Botrytis. The canes have been separated and secured to the trellis wire in some areas to improve air circulation and I reduced the irrigation schedule since there was some standing water around the grow bags. I have put a sample of a blighted blossom in a closed plastic bag with a moist paper towel to see if the fungus will sporulate and hopefully be positively identified. We will begin to apply pesticide sprays soon for both Japanese beetle and spotted wing drosophila, and we will probably add a suitable fungicide. We also sent in a fertigation water sample to double check the nitrogen level getting to the plants.

We hope to nip this problem in the bud!

This symptom of blossom blight on raspberries in the high tunnel was collected today and will be kept in a closed, moist plastic bag to see if the fungus grows.
This symptom of blossom blight on raspberries in the high tunnel was collected today and will be kept in a closed, moist plastic bag to see if the fungus grows.
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Veraison begins with Mars

Mars table grape is the first grape cultivar to undergo veraison – the onset of ripening signaled by a change of color and berry softening in red grapes and a translucence and softening of the berries in white grapes.

Mars is the first cultivar to undergo veraison at the State Fruit Experiment Station
Mars is the first cultivar to undergo veraison at the State Fruit Experiment Station
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Japanese beetles severe this year

Japanese beetles emerged early and are damaging the vineyards, particularly those near Highway 95 and the Research Vineyard adjacent to an unsprayed patch of apples, mulberries and other weeds. This is the most severe outbreak we have seen. Japanese beetles were first seen on grapes at the State Fruit Experiment Station on July 8, 2011.

Japanese Beetles on Norton grapevine.
Japanese Beetles on Norton grapevine.
The beetles are most severe next to the unsprayed area by the chemical building and by Highway 95.
The beetles are most severe next to the unsprayed area by the chemical building and by Highway 95.

 

Posted in Grapes | 2 Comments

Grape phenology and GDD accumulation

GDD base 50 accumulation count beginning April 1 = 1583  http://agebb.missouri.edu/weather/reports/gddTable.asp
Phenology stages according to the Modified E-L system http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf

Last week all cultivars were at stage 32 Berries still hard and green.

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Grape phenology and GDD accumulation

GDD base 50 accumulation count beginning April 1 = 1210  http://agebb.missouri.edu/weather/reports/gddTable.asp
Phenology stages according to the Modified E-L system http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf

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Dr. Elliott’s retirement party

Dr. Elliott is fixing to retire on August 1, 2016. We had a fish fry to help celebrate his retirement. People recounted all that he has done for our State Fruit Experiment Station and for each of us personally. We will certainly miss him!

Thanks to Pam Turner for the photos!

Anson received a commemorative plaque, a poem and a pocket knife as presents.
Anson received a commemorative plaque, a poem and a pocket knife as presents.
He seemed to like the pocket knife best of all.
He seemed to like the pocket knife best of all.
What a sweet retirement card!
What a sweet retirement card!
We will all miss him and we all wish him the best retirement ever!
We will all miss him and we all wish him the best retirement ever!
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Grape phenology and GDD accumulation

GDD base 50 accumulation count beginning April 1 = 1010  http://agebb.missouri.edu/weather/reports/gddTable.asp
Phenology stages according to the Modified E-L system http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf

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