Q. I have a lemon and a lime tree in my yard. For several years now they have only produced one lemon and one lime. I was told that the birds are probably eating the blossoms but I never see any signs of birds in the yard. Can birds be the cause for only one lemon and one lime in two years?
A. I have heard that before from some people who have citrus but I have never seen it. I think it is anecdotal. Some flowers are sweet and if there is nothing else available perhaps they might but not when other food is plentiful. Different citrus flower and fruit at different times of the year.
The reports I have seen point mostly at sparrows or finches as the culprits. To be sure, you would have to catch them in the act. The only solution I know is bird netting or giving them a chance to eat food they would prefer.
The usual problem with lack of production is freezing weather soon after or during bloom. Even before bloom. Flowers, flower buds and young fruit cannot withstand temperatures below freezing while the tree may not have any damage at temperatures slightly below freezing (lime) or to the low 20's (most lemons).
Another possibility is irregular watering, particularly in the spring and summer months when plants require more frequent watering. Increase the times you water during the April and May months. Use a surface mulch on the soil around the tree to retain moisture around the roots.