Inspection area in south central Minnesota has been divided up forĮxisting inspectors to cover. Was necessitated by the departure of inspector Eric Nooker. The quarantine and the prohibited movement of ash trees to Required that a sign be posted on the sales floor informing customers of To allow stores in quarantined counties toĬontinue to sell the ash trees the Minnesota Department of Agriculture Number of years due to state and federal Emerald Ash Borer quarantinesĪnd the likelihood they will not survive to maturity if planted in Minnesota nurseries have not been growing and or selling ash trees for a Quarantine to sell ash trees, it is a violation to transport ash treesįrom regulated counties to non-regulated counties. This spring, a discount chain store wasįound selling ash trees in Minnesota. Regional Inspector's Report East Metro and Southeastern - Steven Shimek, Program Coordinator This is a 3-year disease life cycle, fungicide applications must occurįor 3 consecutive years. Read the chemical label, especially concerning prevention ofįungicidal immunity and rotate the Mode of Action (MOA) accordingly. Year Three: Spores are released and infect third year needles.Ī protectant fungicide of chlorothalonil or mancozeb when new needlesĪre half the length of mature needles, and a second time later.Line appears on the midrib, underneath the needle. The critical time frame of susceptibility. Splashing rain or even center-pivot irrigation. Year Two: May/June - infected needles release spores and spread by.Year One: Needles become infected the fungus overwinters within the needle.The life cycle of the fungus is protracted, Killed by Lirula macrospora remain attached until they have weathered Picea glauca are the more susceptible species. densata), and Colorado blue spruce ( Picea pungens). Lirula Needle Blight ( Lirula macrospora)įungus kills needles of White Spruce ( Picea glauca), Black Hills Spruce Follow-up inspections will be conducted to verify efficacy of treatments.

Adult beetles were also found in traps placed nearby to determine the beginning of the adult flight period.īlocks of plants where grubs were found are restricted pending treatment and control. Grubs and pupae were confirmed as Popillia japonica by MDA personnel. Most of the grubs found were late instar in late June, and many pupae were also found. When one larvae was found, it was likely that more than one was present, up to 6 or 8 per pot. Plants that had more or heavier roots were not favored by the beetle. Some loose potting media at the bottom of the pot seemed to be more likely to harbor beetle grubs. Stock that was positive included: Physocarpus, Taxus, Thuja, Juniperus, Hosta, Heuchera, Atrium, Rosa, Rhus, Celastrus, Vaccinium, and Rubus, several of which are not known to be commonly fed upon by JB larvae or adults.ĭuring a survey of accredited containers at the end of June, larvae were most often found in the bottom 1/4 of the pots. Production history or location of the stock to potentially infested surrounding areas did not seem to influence the likelihood of infestation. There seems to be no common denominator as to why containerized stock grown under the JBHP guidelines became infested during the past year. Observations from recent surveys of accredited container stock Some samples can be destructive in nature, though staff try to minimize the operational and economic impact. Surveying for JB in containers is done by removing plants from pots, examining the potting media for life stages, namely grubs and pupae. More details on the JBHP that was revised in 2016 and became effective Janucan be found at: This is meant to discourage egg laying in and around nursery containers. This certification method requires that container grown stock must be kept on an impervious surface such as gravel. It is important to note that even stock that is in compliance with the Japanese Beetle Harmonization Plan (JBHP) for container accreditation can become infested. The adults can cause significant damage to a number of plants feeding on and skeletonizing leaves and feeding on flowers and fruits. Turf that is fertilized and irrigated is particularly attractive for adult beetles to lay their eggs and for grubs to happily munch away until they pupate and emerge from the soil as the adult beetles the following year. Japanese beetle grubs spend their lives below ground feeding on roots. As a result, nursery stock has become more commonly infested both by the adult beetles, and in a recent incident as grubs and pupae in container grown nursery stock. Minnesota has seen an increase in population and spread of Japanese beetle ( Popillia japonica) to more locations around the state over the past few years. Steven Shimek, Nursery Program Coordinator Having trouble viewing this email? View it as a Web page.Ī Newsletter for the Minnesota Nursery Industry

Lirula needle blight