When
you are growing pears, you will find that pear trees are among the
easiest fruit trees to produce organically because their fertility
requirements are not high. They will adapt to a wide range of climates
and soils and do not have as many pest problems as other fruit trees.
There are many varieties of pear trees. The Asian and European pears can
pollinate each other, but the Asian pears often finish blooming by the
time the Europeans get started. When you cross-pollinate between pear
species avoid matching early bloomers like the Asian-Seuri and Yali with
late bloomers like the European-Comice and Ublillen. Some early
European bloomers are the Bartlett, Beth, and the Conference which will
cross-pollinate with most Asian pears. Even though you can grow
pears from seeds, there is no guarantee as to the quality of the
resulting fruit. It is best to purchase known good stock from a reliable
nursery.
Pears can grow hardy
in any open, sunny area, as long as they are not exposed to strong
winds. They can grow in most soils, but prefer a moderately rich, well
draining soil that is neutral or slightly alkaline. Very rich soils will
encourage rapid leafy growth that can be disease sensitive so you there
is no need to add lots of organic matter unless the soil is very poor
quality or excessively free draining. European pears are grown by
grafting the variety on to a root stock. Seedlings of European pears
(often from Bartlett pears) are usually used for root stocks. When you
plant standard sized trees space them 5-8m (16-26ft) apart and dwarf
trees 3-4.5m (10-15ft) apart. There are some varieties that always need
cross-pollination, and some are reliably self-fertile. Asian pears are
slightly less cold hardy then European types and may suffer tissues
damage at temperatures below -20 degC (-4degF). Also most Asian pears
bloom slightly earlier than the European varieties and could lose some
blooms or buds to freezing in areas that are susceptible to late frost.
Asian pears will grow a heavy fruit crop, which will need hand
thinning of young fruits soon after bloom to ensure a good crop. If
thinning is not done it will effect the fruit size and quality.
Pruning pears involves
cutting off unnecessary branches so that light can reach all parts of
the tree, and it is best to keep the tree levels low to make it easier
to pick the fruit. Most varieties of pear trees ripen usually in early
fall, but the Bartlett pear ripens in the summer. European pears will
only ripen to perfection when they are removed from the tree, so they
are picked when they are still green and hard. On the other hand Asian
pears will ripen on the tree and do not have to be picked and cured like
the European pears. Once they have colored up they should be sweet
enough to pick.
A problem that can
cause serious damage to pear trees is fireblight, which is greatly
favored by young, succulent tissues and it is better to try and limit
the growth to avoid this. You should never try to compensate for rapid
growth rates by pruning, as this will only induce the production of more
vulnerable soft tissue growth. By not using manure, and not applying
large amounts of fertilizer and avoid growing clovers and other legumes
around the tree will ultimately yield better results. A good start is to
choose fireblight resistant pear cultivars to limit the spread of this
disease, but cultural controls are best way. Asian pears are slightly
more resistant than European pears, but once fireblight infection has
taken place there is no spray or other methods that will minimize the
damage. The best thing to do is to cut out the newly effected limibs and
if cutting is done during growing season it should be removed at least
10cm (4in) below the last point of visible infection and burned. After
eac cut the hand pruners should be disinfected in a disinfectant
solution. The best way to deal with insect pests is to encourage natural
predators such as lacewings around your pear tree.