What is the best way to treat or prevent fire blight in Asian pears?
The only treatment is to cut away infected limbs. Good cultural practices, particularly with watering, will help prevent the spread.
This article will help you: https://www.gardeningknowhow.com/plant-problems/disease/fire-blight-remedies-and-symptoms.htm
I have a 2-3 year old asian pear that has upper leaves turning yellowish ina soecific patter. I dont know if its a nutrient deficiency or something else. I dont think there has been any new growth recently when it shouldbe actively growing st this time. It has been rather unnaturally hot for this time of year with little rain. Would you kindly identify what this is and how it can be fixed?
I see at least 1 issue. There could be an issue with iron uptake. I'd look at pH being high. This is a common culprit, since pH fluctuations can lock out iron. An overabundance of phosphorus can cause the pH to go up, as well. I'd test your soil and adjust the nutrients and pH as needed.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
This is an update to the question asked here: https://questions.gardeningknowhow.com/asian-pear-not-doing-well/ I had the pH test done and its more than 8, so by no means low. Can something else be the issue or is the pH on the higher side. I have clay soil and I have tried so many ways to acidify it but none has provided any good results. But cucurbits used to do fine till last season. Can something else be he issue here?
That is very high, as suspected. It needs to be lower. 6.0 to 7. 6.5 would be a good target. I'd do just a few things. I'd add elemental sulfur, first. Then mulch with something acidic, like pine needles or sphagnum moss.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/sulfur-in-plants.htm
https://www.gardeningknowhow.com/ornamental/trees/pine/harvesting-pine-needles.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/raise-acid-level-soil.htm