Tropical Fruit Forum - International Tropical Fruit Growers



Author Topic: White patches on avocado branches?  (Read 667 times)

C24mccain

  • Member
  • ***
  • Posts: 132
    • Lakeland Florida zone 9b
    • View Profile
White patches on avocado branches?
« on: January 16, 2019, 05:50:14 PM »
Can anyone tell me what this white stuff is in these pics on my mexicola avocado tree? I'm getting a few small branches dying as well and this stuff seems to be on those dead twigs fairly often but not always.












MangoCountry

  • Member
  • ***
  • Posts: 158
    • Southeast Florida 10a/b
    • View Profile
Re: White patches on avocado branches?
« Reply #1 on: January 16, 2019, 06:22:50 PM »
Possibly lichen. Harmless if so
« Last Edit: January 17, 2019, 12:38:49 AM by MangoCountry »

Dangermouse01

  • Sr. Member
  • ****
  • Posts: 302
  • East coast, Central Florida
    • USA, Palm Bay, FL 32907, Zone 9B
    • View Profile
Re: White patches on avocado branches?
« Reply #2 on: January 16, 2019, 07:18:48 PM »
Lightly spray with water and see if there are any soft body insect things under it. Kind of looks like mealy bugs or some type of scale.

Jack, Nipomo

  • Sr. Member
  • ****
  • Posts: 376
  • San Luis Obispo County, CA zone 9b
    • View Profile
Re: White patches on avocado branches?
« Reply #3 on: January 16, 2019, 10:17:39 PM »
Looks like dried avocado sap indicating an injury (mechanical or insect).

Mark in Texas

  • Hero Member
  • *****
  • Posts: 3634
    • Fredericksburg Texas, (central TX), zone 8a
    • View Profile
Re: White patches on avocado branches?
« Reply #4 on: January 17, 2019, 10:05:44 AM »
Some kind of disease.  Doesn't quite look like mealybugs.

http://ipm.ucanr.edu/PMG/r8100611.html

C24mccain

  • Member
  • ***
  • Posts: 132
    • Lakeland Florida zone 9b
    • View Profile
Re: White patches on avocado branches?
« Reply #5 on: January 17, 2019, 07:20:06 PM »
Some kind of disease.  Doesn't quite look like mealybugs.

http://ipm.ucanr.edu/PMG/r8100611.html


Thanks Mark I'm pretty positive this is my issue. It's minor at the moment so I'll monitor it.

achetadomestica

  • Hero Member
  • *****
  • Posts: 856
    • FLORIDA 9b
    • View Profile
Re: White patches on avocado branches?
« Reply #6 on: January 17, 2019, 09:29:40 PM »
Copper fungicide?
Try one infected area as an experiment. I have seen something similar on citrus and
even peach trees. I experimented last year and the copper worked?

PahoaJo

  • Member
  • ***
  • Posts: 61
    • Big Island, Hawaii
    • View Profile
Re: White patches on avocado branches?
« Reply #7 on: January 20, 2019, 01:37:09 AM »
Do you see any borer holes, like the size of a pin hole, that the white stuff is surrounding?

C24mccain

  • Member
  • ***
  • Posts: 132
    • Lakeland Florida zone 9b
    • View Profile
Re: White patches on avocado branches?
« Reply #8 on: January 20, 2019, 07:09:08 AM »
Do you see any borer holes, like the size of a pin hole, that the white stuff is surrounding?

I have not seen any but I do know there is a tiny black mite that hits the leaves, often in the center of the leaf leaving a brown spot on the leaf.

Coach62

  • Hero Member
  • *****
  • Posts: 513
    • Naples, FL Zone 10a
    • View Profile
    • Naples Home Inspections
Re: White patches on avocado branches?
« Reply #9 on: January 20, 2019, 11:35:02 AM »
Some kind of disease.  Doesn't quite look like mealybugs.

http://ipm.ucanr.edu/PMG/r8100611.html


Thanks Mark I'm pretty positive this is my issue. It's minor at the moment so I'll monitor it.


My Mexicola has had the same issue for 2years, must be susceptible to it. Probably will pull it and replace after this next crop. The fruit is just so-so anyway.
www.ableinspector.com

Stop New Yorking my Florida!

Bruce

Guanabanus

  • Hero Member
  • *****
  • Posts: 2292
  • SE Palm Beach County, East of I-95, Elevation 18'
    • USA, Florida, Boynton Beach, 33435, Zone 10b
    • View Profile
Re: White patches on avocado branches?
« Reply #10 on: January 20, 2019, 09:41:11 PM »
Not a clear enough image, but it is probably meally bug.  Blast it off with a garden-hose pistol, and repeat 3 or 4 times at about 5-day intervals, then finish up with an oil spray, following label directions about dosing and mixing--- and maintain agitation,
Har

spaugh

  • Hero Member
  • *****
  • Posts: 1953
    • San Diego County California
    • View Profile
Re: White patches on avocado branches?
« Reply #11 on: January 20, 2019, 09:51:55 PM »
Its the sap of the tree like Jack said. 
Brad Spaugh

 

Copyright © Tropical Fruit Forum - International Tropical Fruit Growers