New buds in brown color

General Fruit Growing
#1

Hello,
My first year Flavor Grenade Pluot tree grows well, but recently it has a brown color tip. See picture please:

IMG_20210731_102832696
IMG_20210731_1028326963000×4000 633 KB

It is watered regularly. Here is in Austin, TX. Although the recent temperature is as high as 97F (33C), I think the brown color tip is not the result of sun burn because it is still soft. Because some of my persimmon trees were bitten by unknown pests, I applied (GardenTech’s Sevin 5% dust) once to all the fruit trees, including the flavor grenade pluot.

Could you please tell me what is it?

Thanks,

#2

My bet is flagging from oriental fruit moth. Likely still in the shoot.

#3

Piblarg, thank you for the reply.
Today, it is found a larger leave falls off. I don’t see any bug around there. Here are 2 pictures of its two sides:

IMG_20210802_162156622
IMG_20210802_1621566223000×4000 2 MB
IMG_20210802_162254545
IMG_20210802_1622545453000×4000 2.13 MB

Can you please tell me what is wrong?

Robert