Archives for May 2023

IPM Update 5/03/23

Sweet Corn

There will be significant changes to insect trapping efforts in the Vegetable IPM Program for this season.  At present, personnel are deploying black light and corn earworm (CEW) pheromone trap networks in central and northern New Jersey counties.  In areas from central Burlington County southward, grower cooperators have been provided with CEW pheromone traps and will be monitoring these traps on their own properties and reporting catch data to IPM personnel.  This is an effort to maintain a statewide reporting program for the most significant economic pest of sweet corn despite a shortage of professional staff this year.  The IPM program thanks these growers in the southern counties for their assistance in maintaining this necessary service.

Black light trap derived maps for European corn borer (ECB), CEW and brown marmorated stink bug (BMSB) will not appear in the Plant and Pest Advisory, as there is no longer a statewide blacklight trap network.  Data from existing black lights in the central and northern counties will appear in table format, with associated information on the relevance of the populations.  Provided that  data from the southern CEW pheromone traps is available on a regular basis, maps will be generated for this pest/trap type.   Limited collections from traps thus far have not contained any target pests.

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Landscape Pest Notes for Early May 2023

Fungal Leaf Spots: Commonly found on the foliage of many plants, fungal leaf spots are largely cosmetic diseases. Most do not interfere with the normal growth & development of the plant. Therefore, within the landscape, fungicides are not normally recommended. Years that have relatively dry spring weather will experience fewer leaf spot infections.

Many fungal leaf spot infections will demonstrate typical symptoms. Surrounding the initial infected spot will be alternating light-dark-colored concentric rings. The darker areas contain plant-defensive chemicals that the plant uses in an attempt to compartmentalize the invading fungus. If the fungus is virulent enough it may have the ability to move past the barrier & infect the tissue outside of it. The plant will respond again & form a new barrier surrounding the infected area. Sometimes these light-dark discolorations can continue until a target appearance forms. Many times, black fruiting bodies can be seen within the center of the light-colored bull’s eye site where the infection originated.

A dark colored halo will often surround the central fungus infection site. The black fruiting bodies can be observed within the central tan area. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)

Alternating light-dark colored concentric rings. The dark rings are composed of plant defensive chemicals the plant uses in the attempt to wall-off the invading fungus. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)

 

 

 

 

 

 

 

 

 

 

The Landscape Pest Notes Blog for Early May 2023 is listed below & is composed of some commonly observed insect/mite & disease pests occurring within landscape & nursery plants. The insect/mite pests included are andromeda lace bug, lilac borer, boxwood leafminer, spruce spider mite, & horned/gouty oak galls. The disease pathogen pests included in addition to fungal leaf spots are black knot, sycamore anthracnose, Diplodia tip blight, & apple scab fungus. 

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