See All Pest, Disease and Weed Identification

Emerald Ash Borer (EAB) is a destructive, introduced insect of North American ash trees. It has been the cause of widespread ash tree decline and mortality throughout northeastern North America.

Exclusion prevents the entrance of pest organisms into new rooms and their escape from older ones. The latter should not be underestimated.

Recap the 2025 crop production season, discover agronomic innovations, and earn valuable certification credits. Attendees gain expert insights, network with industry leaders, and enjoy a buffet lunch.

Annual sowthistle (Sonchus oleraceus) is one of the annual thistles.

Este video revisa los fundamentos de la exploración adecuada y la identificación de enfermedades comunes y sus síntomas.

Flies in the family Syrphidae are helpful allies in the garden and in the greenhouse or nursery.

Varroa mites (Varroa destructor), are the most influential of all of the pests and diseases of the European honey bee (Apis mellifera) today.

Bull thistle (Cirsium vulgare) is a biennial that, true to its name, has notable spines. This plant is much different than Canada thistle.

Ground and tiger beetles are important biological control agents in agroecosystems. They consume many soil dwelling insect pests.

Spiders are beneficial animals that feed on arthropods, including insects. Spiders rarely bite people, and most species found in the world are harmless.

There are numerous insects that can be considered "beneficial."

My neighbor came up to me last month and told me he was sorry that my tree had died. I was puzzled, because I was not aware that any of my trees had died.

Oak wilt is not known east of the Susquehanna River in Pennsylvania. In 2021, there was a suspected case on the border of Chester and Delaware counties that has since been discredited.

Staphylococcus aureus is a common bacterium, but is capable of causing diseases ranging from minor soft tissue infections and food poisoning to serious medical problems such as toxic shock syndrome.

Wild onion (Allium canadense) and wild garlic (Allium vineale) are perennial plants that can be a weed in turfgrass and landscape beds.

Yellow woodsorrel (Oxalis stricta) has foliage (composed of three leaflets) that resembles white clover or black medic.

Infestations of red mites can result in smaller fruit and a reduced fruit bloom the following season.

Autumn olive (Elaeagnus umbellata) is an invasive shrub. This article includes images for identification and recommendations for control.

Purple loosestrife may be beautiful in the garden, but the potential degradation of our wetlands because of this invasive plant is grand.

Prostrate knotweed (Polygonum aviculare) is a summer annual.

Poison hemlock (Conium maculatum) appears to have become more abundant over the past few years.

Pineappleweed can be either a summer or winter annual.

Getting to the bottom of a plant problem can be a challenge.

A number of grass species appear in lawns and ornamental beds and are considered weeds.

A weed that has been spreading in recent years in the nursery and landscape trade is mulberry weed.