Dusty looking spruce, arborvitae, boxwoods and rhododendrons in the fall could be signal the presence of cool season spider mites.
Archives for September 2018
Tubakia leaf spot, a fungal disease, infects all species of oak. However, oaks in the red oak group such as black, red and pin oak, appear to be most susceptible. Symptoms on oak include small to large dark brown or reddish-brown spots or blotches. (Figs 1,2,3) Spotting that occurs on leaf veins may cause large extended areas of dead leaf tissue along the veins (Fig 4). Marginal leaf scorch may also be seen to contain lesions of Tubakia (Fig 5). If trees are heavily infected with Tubakia leaf spot, premature defoliation may occur, however, the disease usually develops so late in the season that overall health of the tree is not affected. Fungicide sprays are not recommended. Cultural practices include maintaining good tree vigor by watering during drought stress periods and fertilizing trees appropriately. A type of anthracnose known as spot anthracnose, may also be present on leaves infected with[Read More…]
Although most “conifers” are “evergreen”, a few species are “deciduous”. Confused? Perhaps a review of these terms will help. conifer = cone-bearing evergreen = retains at least some green foliage year-round deciduous = all leaves die and are shed annually at same time Evergreens provide green color all year long but that doesn’t mean that the individual needles live forever. Evergreens shed their older needles to make room for new growth, but what makes these plants evergreen is that they retain some foliage all year long instead of shedding all of the leaves at once. Conifer needles have varying life spans, depending on the species and environmental conditions. White pine and arborvitae needles live for 2-3 years, Austrian and Scots pine needles live for 3 years, red pine needles live for 4 years. Firs, Douglas fir, and hemlock needles last about 3-4 years. Spruce needles live 3-10 years depending on[Read More…]
It’s never too early to protect your trees from gypsy moth! Across the Central and Northeastern US gypsy moths had a population boom this summer. Although we do not have firm predictions for next year yet, you can still start planning and protecting your trees now! Fall is the perfect time to check your property for gypsy moth eggs. Gypsy moths aren’t picky about where they lay their eggs. Look for them on trees, houses, trailers, fence posts, and other surfaces near your home. Usually, a few egg masses won’t severely damage your tree, but if you find more than 10 it’s time to start thinking about treatment options. Here are the two main methods for managing eggs. First, you can manually remove them by gently scraping them with a knife or paint scraper. Throw the eggs in soapy water or in your freezer. Leave them for two or more[Read More…]
Resources for managing and stopping spotted lanternfly are growing almost as quickly as this pest is spreading. We report on new resources for protecting your plants!
Eliminate stinging threats from ground nesting wasps by treating them at night when they are all tucked in their nests.
Oak wilt has been found in most counties in Indiana and is one of the most serious threats to the health of oak trees in the Midwest, especially those in the red oak / black oak group. The disease is caused by the fungus Ceratocystis fagacearum and is spread from tree to tree by sap feeding beetles and by natural root grafts between trees. Beetles carry spores of the fungus from infected trees to fresh wounds leading to infections in the canopy. Root of oaks of the same species nearby normally join as grafts when they grow together, providing the other means of spread from one infected tree to other nearby oaks. Trees in the red oak and black oak group are highly susceptible. When infected early in the summer red oaks usually wilt rapidly, show extensive summer leaf drop and may die by fall, or spring of the year[Read More…]
Biology: Yellow nutsedge (Cyperus esculentus), also known as chufa (chufa is a non-weedy variety that is used for wildlife food plots and is not a cold hardy weed like yellow nutsedge), nutgrass, or watergrass, is a troublesome, difficult-to-control perennial weed found throughout the United States. It is important to understand that yellow nutsedge is not a grass or a broadleaf weed, but a sedge; which is crucial when determining effective control strategies. It establishes by rhizomes, which form tubers (called nutlets) that are capable of surviving in the soil for periods of up to ten years. These nutlets, as well as viable seed, sprout and establish from May until the end of July. Reproduction by tubers can be very prolific. A trial in Minnesota found that one nutsedge tuber produced 1,900 shoots and 6,900 tubers within one year (Tumbelson and Kommedahl, 1961)! Identification: Yellow nutsedge can be identified by solid, triangular-shaped stems[Read More…]