Synthetic auxins are used in apple fruit production, mostly NAA. Please suggest me a research on naturally occurring auxin IAA, it's stability and/or efficacy in field application in fruit production, especially fruitlets thinning (apple or any other fruit species). IAA of bacterial origin is preferable, or other as well.
For the interesting subject of fruit thinning, I have 2 references: the first is a PhD thesis from Virginia (U.S.A) & the second is a review from Slovenia. I hope that they help in what you are looking for at least partially. My regards.
Commercial apple and pear growers can spray their trees at the appropri-
ate time with certain chemicals, which will cause some fruit to drop. Chemical thinning is not an option for most non-commercial growers. It is a very precise operation, and either no thinning or over thinning can result. Good results depend on selection of the correct chemical, rate and time of application. Weather conditions before, during and after application can influence the results. When done properly, chemical thinning gives the best results of all the methods used, since it is done earlier than the others. Chemical thinning is also the least expensive method. Sevin, a common insecticide, will cause fruit thinning in some varieties of apples when applied within 30 days after full bloom.
Please see the attach file related to thinning tree fruit.
With regard
GOOD DAY
Hello!
I have long experience in fruit thinning with auxins, but in citrus. In this case we can use NAA, or other auxins (2,4-D, 2,4-DP, etc.). Normally exogenous application of IAA has little effect on plants. Moreover, it is far more expensive than the other auxins and therefore I do not think it is economically feasible to apply IAA.
In any auxin, it is important to know the applied chemical form (acid, salt, ester) which is more effective.
Best regards
Amílcar Duarte
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