Blue and green mold are two of the most important post-harvest diseases that can affect a citrus crop. The infection that occurs the most frequently is green mold and it is caused by the mold Penicillium digitatum. It exists in all citrus fruit growing regions and is a serious threat to the citrus industry.
When the fruit is bruised or punctured while it is being harvested or packed, the mold enters the fruit through these wounds and therefore, this disease can be contracted by fruit on the tree, in the packinghouse where the fruit is prepared for the market, while in transit to the store, in storage, and the retail store. At first, only a white mold is seen growing on the outside of the fruit and later begins to turn green due to the large amount of spores that are being produced on the surface of the fruit. The fruit begins to decay and become soft. It shrivels up and dies as a result.
Blue mold is caused by the fungus Penicillium italicum and it is different from green mold mainly because of the color. The conditions that the two molds grow in are very similar and tend to grow best at around 75 degrees Fahrenheit. Their growth is slowed by lowering the temperature and cooling fruits while they are being stored and shipped are a good way to decrease the amount of infections in a shipment. Losses from these molds can also be greatly reduced by taking special care during harvesting and transporting not to bruise or break the skin of the fruits. Fruits mainly become infected when their outer skin is broken and mold spores make their way inside either from contaminated soil, another infected fruit, or through the air. Fungicides can also be used to reduce the amount of infections. Also, any equipment used to pack the fruit and anywhere they are stored should be sanitized every day to reduce the chance of the fruit becoming infected.
The spores of both of these molds are very easily spread by air currents and any fruits that are contaminated with them should not be exposed to wind or other currents of air near any healthy fruit due to the likelihood of it becoming infected. Fruits can also become infected due to other physical injuries such as those associated with stem-end rind breakdown and chilling injuries.
Showing posts with label fruit. Show all posts
Showing posts with label fruit. Show all posts
Friday, January 18, 2008
Gray Fruit Mold Causes Food And Fruit Rot
One of the most frequent and serious causes of fruit rot in strawberries, blackberries, and raspberries is gray mold. This can affect not only the fruit itself, but also the petals, fruit caps, and flower stalks. There is not another disease as serious as this one during a wet, warm growing season. This is the most extreme during the years that have a prolonged cloudy and rainy period during the fruit’s blooming season or harvest.
Young fruit blossoms are typically the most susceptible to the infection and they usually start to show infection in a cluster of fruit. Blossoms generally show the fruit infection as a soft, light brown, and quickly growing spot on the fruit. If it is let to remain attached to the plant, it will shrink, dry up, and become covered in a powdery, gray substance. This is where the disease gets the name of gray mold.
Fruit that are the most commonly affected are located toward the middle of the plant where the leaves and branches cause the humidity to be high and air circulation to be low. When strawberries rest upon the soil or when one strawberry touches an infected one or just a dead leaf, the fruit rot will begin.
Mature fruits are also susceptible after they are picked, but the younger green fruits may become just as infected; however, the disease isn’t usually detected until later when the fruit is ready to be harvested. Mature fruits are likely to be infected because of bruising or the breaking of the skin and if the conditions for the disease are favorable, mature fruits can become completely rotted as little as 48 hours after being picked.
To prevent gray mold from growing on your fruit, you should select a site to plant your fruit that has a good amount of soil drainage and air circulation. They should also be exposed to direct sunlight.
A good amount of straw mulch should be put between the plants to reduce the amount of contact the healthy fruit has with the soil.
Keep your fruit garden weeded, since it will slow the air movement in the canopy of the plant. Fruits need to be dry to reduce the chance of infection.
Remove any berries that have become diseased, but do not leave them in your garden. Take them away and make sure they do not come into contact with anything else you are growing.
Young fruit blossoms are typically the most susceptible to the infection and they usually start to show infection in a cluster of fruit. Blossoms generally show the fruit infection as a soft, light brown, and quickly growing spot on the fruit. If it is let to remain attached to the plant, it will shrink, dry up, and become covered in a powdery, gray substance. This is where the disease gets the name of gray mold.
Fruit that are the most commonly affected are located toward the middle of the plant where the leaves and branches cause the humidity to be high and air circulation to be low. When strawberries rest upon the soil or when one strawberry touches an infected one or just a dead leaf, the fruit rot will begin.
Mature fruits are also susceptible after they are picked, but the younger green fruits may become just as infected; however, the disease isn’t usually detected until later when the fruit is ready to be harvested. Mature fruits are likely to be infected because of bruising or the breaking of the skin and if the conditions for the disease are favorable, mature fruits can become completely rotted as little as 48 hours after being picked.
To prevent gray mold from growing on your fruit, you should select a site to plant your fruit that has a good amount of soil drainage and air circulation. They should also be exposed to direct sunlight.
A good amount of straw mulch should be put between the plants to reduce the amount of contact the healthy fruit has with the soil.
Keep your fruit garden weeded, since it will slow the air movement in the canopy of the plant. Fruits need to be dry to reduce the chance of infection.
Remove any berries that have become diseased, but do not leave them in your garden. Take them away and make sure they do not come into contact with anything else you are growing.
Gray Fruit Mold Causes Food And Fruit Rot
One of the most frequent and serious causes of fruit rot in strawberries, blackberries, and raspberries is gray mold. This can affect not only the fruit itself, but also the petals, fruit caps, and flower stalks. There is not another disease as serious as this one during a wet, warm growing season. This is the most extreme during the years that have a prolonged cloudy and rainy period during the fruit’s blooming season or harvest.
Young fruit blossoms are typically the most susceptible to the infection and they usually start to show infection in a cluster of fruit. Blossoms generally show the fruit infection as a soft, light brown, and quickly growing spot on the fruit. If it is let to remain attached to the plant, it will shrink, dry up, and become covered in a powdery, gray substance. This is where the disease gets the name of gray mold.
Fruit that are the most commonly affected are located toward the middle of the plant where the leaves and branches cause the humidity to be high and air circulation to be low. When strawberries rest upon the soil or when one strawberry touches an infected one or just a dead leaf, the fruit rot will begin.
Mature fruits are also susceptible after they are picked, but the younger green fruits may become just as infected; however, the disease isn’t usually detected until later when the fruit is ready to be harvested. Mature fruits are likely to be infected because of bruising or the breaking of the skin and if the conditions for the disease are favorable, mature fruits can become completely rotted as little as 48 hours after being picked.
To prevent gray mold from growing on your fruit, you should select a site to plant your fruit that has a good amount of soil drainage and air circulation. They should also be exposed to direct sunlight.
A good amount of straw mulch should be put between the plants to reduce the amount of contact the healthy fruit has with the soil.
Keep your fruit garden weeded, since it will slow the air movement in the canopy of the plant. Fruits need to be dry to reduce the chance of infection.
Remove any berries that have become diseased, but do not leave them in your garden. Take them away and make sure they do not come into contact with anything else you are growing.
Young fruit blossoms are typically the most susceptible to the infection and they usually start to show infection in a cluster of fruit. Blossoms generally show the fruit infection as a soft, light brown, and quickly growing spot on the fruit. If it is let to remain attached to the plant, it will shrink, dry up, and become covered in a powdery, gray substance. This is where the disease gets the name of gray mold.
Fruit that are the most commonly affected are located toward the middle of the plant where the leaves and branches cause the humidity to be high and air circulation to be low. When strawberries rest upon the soil or when one strawberry touches an infected one or just a dead leaf, the fruit rot will begin.
Mature fruits are also susceptible after they are picked, but the younger green fruits may become just as infected; however, the disease isn’t usually detected until later when the fruit is ready to be harvested. Mature fruits are likely to be infected because of bruising or the breaking of the skin and if the conditions for the disease are favorable, mature fruits can become completely rotted as little as 48 hours after being picked.
To prevent gray mold from growing on your fruit, you should select a site to plant your fruit that has a good amount of soil drainage and air circulation. They should also be exposed to direct sunlight.
A good amount of straw mulch should be put between the plants to reduce the amount of contact the healthy fruit has with the soil.
Keep your fruit garden weeded, since it will slow the air movement in the canopy of the plant. Fruits need to be dry to reduce the chance of infection.
Remove any berries that have become diseased, but do not leave them in your garden. Take them away and make sure they do not come into contact with anything else you are growing.
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