Bartlett pear trees are partially self-fertile; they perform better with a pollination partner of a different variety nearby. d’Anjou, Bosc, and Comice are good partners. It’s not clear what you mean re the Bradford pears. Whatever luck you have had may be due to the presence of the other fruit trees; we can not confirm that at this time and you might consider consulting your local cooperative extension (see here http://www.almanac.com/content/cooperative-extension-services ) or a local nursery.
BONIDE is the spray to which you refer (Biodine is something else), and it appears from the label that it should not be used on pears, as you suggest; pear trees are not listed on the label. It appears from our research that pears require frequent spraying of organic oils. You can see a proposed schedule here: https://extension.unh.edu/resources/files/Resource005256_Rep7402.pdf (This is from the University of New Hampshire cooperative extension service. Using the link above you can find the service nearest you and see if they suggest other options for your area.)
Bartlett pear trees are partially self-fertile; they perform better with a pollination partner of a different variety nearby. d’Anjou, Bosc, and Comice are good partners. It’s not clear what you mean re the Bradford pears. Whatever luck you have had may be due to the presence of the other fruit trees; we can not confirm that at this time and you might consider consulting your local cooperative extension (see here http://www.almanac.com/content/cooperative-extension-services ) or a local nursery.
BONIDE is the spray to which you refer (Biodine is something else), and it appears from the label that it should not be used on pears, as you suggest; pear trees are not listed on the label. It appears from our research that pears require frequent spraying of organic oils. You can see a proposed schedule here: https://extension.unh.edu/resources/files/Resource005256_Rep7402.pdf (This is from the University of New Hampshire cooperative extension service. Using the link above you can find the service nearest you and see if they suggest other options for your area.)