En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Spots on non-native naval orange trees from Stockton CA

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
    
 
See a list of all Smarty Plants questions
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.

Need help with plant identification, visit the plant identification page.
 
rate this answer
Not Yet Rated

Saturday - October 20, 2012

From: Stockton, CA
Region: California
Topic: Non-Natives, Diseases and Disorders, Pests, Edible Plants, Trees
Title: Spots on non-native naval orange trees from Stockton CA
Answered by: Barbara Medford

QUESTION:

I have two mature Navel Orange trees. One tree has developed spotty chlorophyl depleted areas that were not on the oranges when they were smaller. In addition, the oranges on both trees are smaller , by half, than normal for this time of year. Tanglo and Lemon on both sides show no sign of this problem..It really looks like something is eating small areas of chlorophyl.

ANSWER:

Citrus x sinensis means it's not from around here, not even in California. Orange trees probably originated in Southeast Asia and were cultivated in China by 2500 BC. We always want to know where a plant is native, because that helps us know in what soils, rainfall and climate it grows well. The Lady Bird Johnson Wildflower Center, home of Mr. Smarty Plants, is dedicated to the growth, protection and propagation of plants native not only to North America but to areas where those plants grow naturally.

Even though we will have no information in our Native Plant Database on oranges, we will try to find some websites that might give you some clues:

University of Florida Extension Citrus Black Spot Symptoms in Brazil.

San Francisco Chronicle Citrus Fruit with Black Spots

To get information on a plant that is not necessarily native but does grow locally, we suggest you contact the University of California Cooperative Extension Office in San Joaquin County.

 

 

More Pests Questions

Possible freeze damage in Wax Myrtle from last winter in Bastrop, TX
July 25, 2011 - Our Wax Myrtle is about 7 yrs old and in good shape until this past winter when we had several very hard freezes. Now several of the large branches are dead and more are dying each month. We have not ...
view the full question and answer

Controlling Cochineal Insects on Cholla Cactus
July 07, 2011 - We have cochineal insects on a cholla cactus. Will they kill the plant? What should we do to get rid of them if water spraying them won't work?
view the full question and answer

Antelope Resistant Plants for Casper, Wyoming
August 12, 2011 - What are some drought resistant, full-sun plants for Wyoming that are Antelope resistant - Deer are not much of a problem, but antelope are!
view the full question and answer

Are non-native hostas causing fly invasion from Eastpointe MI
July 14, 2013 - I live in Michigan with a small backyard. I have 5 large hostas with the purple flower blooms which are located by my patio. I was wondering if they can be causing my large population of unwanted flie...
view the full question and answer

Flying insects eating leaves of non-native Brugmansia in Aline CA
October 17, 2013 - I have an Angel Trumpet tree. We live in Aline, California 30 miles east of San Diego. Little yellow and black flying bugs eat the leaves. Do you have a remedy for this problem.
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center