Q.Pear tree, young pears fall off
My 4-yr-old pear tree looks healthy. Blossom good, pears form, then fall off with stalks when about 1cm diam. This spring I followed advice and sprayed blossom buds with bug spray (green/black fly type) but the same happened
A four year old pear may not be quite mature enough to fully fruit. It is able to flower and start a pear but not finish the job. Depending on the cultivar, pear trees start fruiting when 5-10 years old. Another potential issue is pollination. Many pears are not self-pollinating. They need another tree to cross-pollinate for fruit to succeed. There is more information at this link: http://treefruit.wsu.edu/orchard-management/pollination/