Excellent foreign varieties of walnut

   1, Payne

Source and distribution of   : Origin of USA. At present, the cultivated area in California is second only to Hartley. It belongs to the variety type of late bearing walnut.

   fruit economic characters: nuts are medium to small, with an average single fruit weight of 11.25g. The suture is tight, the kernel rate is 48%, and the light-colored nucleolus accounts for about 50%.

   growth and fruiting habits: the tree body is medium size, the crown is round, and the growth potential is strong. High yield, lateral mixed bud rate up to 80%-90%. In order to prevent excessive fruiting, young trees need moderate or heavy pruning, and adult trees need to be re-pruned properly to maintain their growth. Precocious variety. The leaves were unfolded in mid-late March and flowered in mid-late April in California, USA, and the male and female florescence coincided with each other, so a higher yield could be obtained when the variety was planted and matured at the beginning of September. But it is vulnerable to apple bark moth and bacterial black spot. It is suitable for sparse planting in the middle crown.

   2, Wiener (Vina)

Source and distribution of   : originated in the United States, the main variety in the United States, introduced to China in 1984. It belongs to the variety type of early bearing walnut.

   fruit economic characters: nut conical, fruit base flat, fruit apex acuminate, nut weight 11g. The shell is 1.4 mm thick and smooth. The suture is slightly wide and flat, and the combination is tight. It is easy to take benevolence, and the benevolence rate is 50%.

   growth and fruiting habits: the tree is medium size, strong and upright. The rate of lateral mixed buds is 80%. Above, early fruiting type varieties. Male first type, medium-ripe variety. This variety is suitable for the climate of North China walnut cultivation area, and its cold resistance is stronger than other American varieties. High yield in the early stage.

   3, Francetti (Franquette)

Source and distribution of   : French origin. A large number of walnuts have been introduced and cultivated in Europe and the United States. It belongs to the variety type of late bearing walnut.

The economic character of    fruit: the nut is medium, the average weight of single fruit is 11.09g. The sutures are tight. The rate of producing kernel is 46%, and the color of nucleolus is very light.

   growth and fruiting habits: the tree is tall, upright, medium to prosperous. In general, only the terminal bud can bear fruit and is more productive. The late-maturing variety matured in late September in California. The most important feature of this variety is that it sprouts and blossoms late in spring, which can avoid the harm of late frost. It is suitable for sparse planting with large crown.

   4. Source and distribution of Chico: a hybrid progeny of Sharkey (Sharkey) X Makaidi (Mar- chetti) from USA, is a good early fruiting variety.

The economic character of    fruit: the nut is medium, the average weight of nut is 10.64g. The sutures are tight. The kernel rate is 47%, 70% is light-colored nucleolus, and the quality of nucleolus is excellent.

   growth and fruiting habits: the tree is small, the crown is round, erect. The yield is strong, and the seed setting rate of lateral buds reaches 90% to 100%. It spreads its leaves in mid-late March and blossoms from late April to early May in California, USA. The crown of this variety is small and erect, so it is suitable for close planting (hedge type) cultivation.