The Eastern North American black raspberry and the South American tetraploid black raspberry are grown in a limited scale.
There are also limited acreages of yellow raspberries growing, which are mutations of red raspberries and purple ones, which are hybrids of red and black raspberry genotypes.
The raspberry of greatest importance in commercial production is deciduous perennial with biennial status stems, the upright primocanes being produced in the first year of growth and the fruit-bearing laterals produced from them in the second year, when the canes are known as ‘floricanes’.
Fruit ripening in raspberry usually takes about 30-36 days from pollinating. Abscission layers form upon ripening where each drupelet is attached to the receptacle and so once the fruit is harvested the receptacle or plug remained attached to the lateral.
Red raspberries are indigenous to Asia, and North America denotes Mount Ida, in the Caucasus Mountain of Eastern Europe. While black raspberries are indigenous to only North America, where they are most abundant in the East, exclusive of the Gulf states, but also found in the West.
Raspberry fruit
