black spots on pear tree leaves

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ddiesel
Posts: 2
Joined: Sat May 19, 2012 5:13 pm
antispam: no
city_state: Elmira, NY

black spots on pear tree leaves

Post by ddiesel » Sat May 19, 2012 5:26 pm

I have two pear trees about 8 ft tall been in the ground about 4 years. Very healthy new growth but both have black spots on leaves. Any idea as to what this might be and how I can solve it.

Appledoc
Posts: 51
Joined: Mon Nov 17, 2008 10:16 am
Location: Winchester, VA

Re: black spots on pear tree leaves

Post by Appledoc » Thu May 24, 2012 12:23 am

There are a couple possibilities for black spots on pear leaves. This early in the season, it could be frost injury or spray injury such as a combination of spray oil and sulfur or captan fungicide. It is probably not fire blight which more typically involves whole blossom clusters and advances to kill and blacken whole shoots. Later in the season possibilities would be mite injury or a fungal disease called Fabraea leaf spot, but they probably would not be appearing this early in your location.

Regarding how to solve it, have you had any frost events in your area in the past 3-4 weeks, or is spray injury a possibility for you? Distribution of spots on the leaves of actively growing shoots can provide a clue about when an event occurred that might have been their cause. Are the spots present on all of the leaves of the growing shoots or just on the older or younger (shoot tip) leaves? Are the spots similarly ditributed all over both trees?

ddiesel
Posts: 2
Joined: Sat May 19, 2012 5:13 pm
antispam: no
city_state: Elmira, NY

Re: black spots on pear tree leaves

Post by ddiesel » Thu May 24, 2012 6:41 am

Thanks for responding. Actually we have had a couple of frosts in the last 3 to 4 weeks. These were after the trees had flowered. Hopefully that is the problem, I will watch and see if they worsen. Thanks again

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