Transcript Blueberry

Scientific Name : (Vaccinium spp.) are a
member of the heath family (Ericaceae),
grown as a perennial crop.
Blueberries have a blue to blue-black
epidermis or skin that is covered by a
waxy bloom, giving the fruit a light blue
appearance.
 Berries have two kinds :
1. Highbush : blueberries are tall, with some cultivars
reaching a height of 6 to 8 feet. Their berries are larger
and more abundant than those of the lowbush type,
although their flavor may be somewhat less intense
and sweet.
2. lowbush : these shrubs grow no taller than 2 feet and
may be smaller, depending on soil and climate.
 highbush berries require fewer chill hours and can lose
fruit to frost damage if grown in areas where Spring
temperatures drop to < 0 °C
 Pre-cooling Conditions: Blueberries for fresh market
should be forced-air cooled to < 10 oC , then maintained
under refrigeration at 0 to 3 °C , Pre-cooling to 5 ºC .
 Can cause condensation problems in lowbush
blueberries when packed at ambient temperatures, but
should be incorporated when delays between picking
and packing exceed 21 h
Optimum Storage Conditions: Blueberries should be held at
-0.5 to 0 ºC , with > 90% RH, for up to 2 weeks for lowbush .
Controlled Atmosphere (CA) Considerations: highbush, and
lowbush blueberries benefit from 10 to 15% CO2 + 1 to 10% O2
when held at or below 5 ºC .
Retail Outlet Display Conditions: Blueberries should be stored
and displayed under refrigeration with temperatures as close to 0
°C as possible.
Chilling Sensitivity: Blueberries are not known to be chilling
sensitive.
Ethylene Production and Sensitivity: Ethylene production
ranges from 0.5 to 2 μL kg-1 h-1 for highbush .
 Physiological plant disorders are caused by non
pathological disorders such as poor light, weather damage, waterlogging or a lack of nutrients, and affect the functioning of
the plant system. Physiological disorder are distinguished
from plant diseases caused by pathogens , such as a virus or
fungus .
 While the symptoms of physiological disorders may appear
disease-like, they can usually be prevented by altering
environmental conditions. However, once a plant shows symptoms
of nutrient deficiency it is likely that that season’s yields will be
reduced.
1- Ripe rot : Anthracnose or ripe rot is a common pre- and
post-harvest fruit rot of highbush blueberry in British
Columbia. It is caused primarily by the
fungus Colletotrichum acutatum.
2- Fruit shrivels or drought : Blueberries do not wilt as readily as
many other plants. Berries will shrivel and drop before leaves die.
3- Frost Injury causes fruit to have a dark, shrunken
appearance that readily distinguishes them from unaffected
fruit. Severely damaged fruit appear hollow when cut in half.
Frost or freeze injured fruit may drop to the ground
prematurely before harvest.
4- Alternaria Fruit Rot : causes black or dark moldy growth
on the blossom end of the berry. Berries later shrivel and
darken.
5- Mummy Berry infected fruits shrivel and turn pink. They are
inedible. Mummified fruit drop to the ground prematurely.
These overwinter to cause primary leaf infections the following
spring.
Thank You
Name : Aya Sameeh Soulyman
Number : 0083875