Actually the constant rain has stopped so I'm watering every 2 or 3 days. Everything else is doing great. Blossom end rot sounds like the culprit, is there anything I can do about it? My sis in law is a master gardener, she's never seen this in her 70+ years of gardening.
blossom end rot is a calcium deficiency, often brought about by either a lack of sufficient calcium in the soil or (the most often cause) moisture levels fluctuating with periods of dryness that make calcium uptake more difficult.
I fought blossom end rot all last year on my maters, peppers, and zucchini, and it took multiple steps to get it corrected to where it's not an issue this season
a) I adjusted the soil pH into the 6.5 range that most garden veggies prefer. my native soil averages a pH reading of 8.2, and this impairs calcium from moving freely into the root system. I used Espoma soil acidifier (horticultural Sulphur and fish meal) at the rate directed to bring my soil into the 6.8-6.3 range across each bed. amazing how well the veggies are growing this year with just a pH adjustment, and no calcium deficiency symptoms visible in any of the beds. I have well water that is very hard and mineral rich, so watering was compounding my alkaline soil issue last year.
b) I took into account that I garden in a near desert like microclimate that averages just 5"-8" of annual rainfall. for the mater bed, I mounded a row 6"-9" taller than the surrounding soil, set a soaker hose down the center of the row, then covered it with black plastic tucked in along the sides. maters were planted in cutouts in the plastic and sit adjacent to the soaker hose. this has eliminated the moisture quickly escaping even after a long soaking, and evened out the moisture content throughout the day. the maters and peppers love this consistency, and the cause of moisture stress invoking blossom end rot is removed. I covered the plastic with a 1"-2" layer of mulch to keep the sun from warming the covered soil too much
c) in addition to b, I also worked several yards of composted leaves and mulch into each row. this helps with drainage and moisture retention on the rows not covered with black plastic. I also covered the rows with 1"-2" of mulch after planting
it was a lot of work this Spring, but necessary. I'm being rewarded with outstanding results all around because of it.
my last remaining issue I'm fighting this year is that the daily humidity is too low, and this is causing the mater bloom stamens to not be as 'sticky' as they should to easily hold onto the pollen within their blooms. I may have to supplement watering with some kind of action on the surface that will evaporate and raise humidity in the close proximity of the blooms. this is somewhat releived when daily high temps are in the mid-80s and lower. when temps are 100F and above like we've had the last many weeks, it's just sad to have thousands of mater blooms in the row but very few fruits setting.