More – you guessed it ……….. weevils

annual bluegrass weevil pupa – photo credit Emily Hartwig

annual bluegrass weevil damage

A new round of yellowing annual bluegrass is evident now. This appears to be damage caused by either the second generation of the annual bluegrass weevil larvae (ABW) feeding or the last of the late migration of the first wave of ABW. We are finding mostly pupae now. It is very confusing. Either way, the way this season is playing out it seems that ABW populations have not been synchonous and we could still see some ABW damage in the future. The good news is that the turf is not really under any stress so the damage that we have witnessed and heard about is pretty minimal.

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The other weevil

Bluegrass billbug larvae

Bluegrass billbug frass

Bluegrass billbug damage (the other weevil that feeds on turf) is showing up now on homelawn turf. It seems to be causing damage to Kentucky bluegrass (it’s favourite food source) and fine fescue. The telltale signs are turf that pulls out easily at the crown and sawdust frass in the thatch. It appears that we are at the peak of the damage as most of the weevils that we are finding are third instar. Consider overseeding damaged areas with endophytic species of perennial ryegrass, fine fescue or tall fescue to help prevent bluegrass billbug damage in the future.

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Chinch revving up

Second instar hairy chinch bug nymph

We (my summer student Emily Hartwig and I) have begun bio-insecticide trials on hairy chinch bugs with Dr. Michael Brownbridge and his crew from Vineland Research and Innovation Centre. Chinch bugs are abundant, but still quite small at our test sites in Orangeville. The photo is one of the 2nd instar nymphs that we collected and Emily photographed. Those of you in more southerly areas will be seeing the larger nymphs now. We found out that chinch bugs love to congregate in black composted bark that is often used to overseed damaged turf areas. When we poked around in those areas they were literally crawling with little red early instar chinch bug nymphs. Expect to see damage in a week in the southerly areas and probably in two weeks in the more central and northern areas. The new formulation of MET52 is labelled for hairy chinch bugs but we do not have any first-hand experience with this product.

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Brown patch by the numbers

Two brown patch rings meeting to form the number 8

Brown patch symptoms

The steamy night on Sun. July 20th started the development of brown patch again this summer on closely mowed golf course turf. The forecast is for one more night like this and then the night time temperatures are going to cool to the mid-low teens. This should keep the brown patch at bay, but look for the symptoms to intensify for one or two more days before they subside.

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Turfgrass insects bad news/good news

Bad news – black cutworms are feeding on golf greens. Good news – they are large caterpillars now and probably almost finished feeding.

Bad news – annual bluegrass weevil adults are being found on golf greens. The good news is the weevils have finished feeding and there should be no further damage from the weevils this summer.

Bad news – hairy chinch bug nymphs are developing quickly. The good news is that having adequate rains may limit their feeding damage over the next couple of weeks.

Bad news – black turfgrass ataenius grubs are feeding and growing quickly and there will be damage visible shortly. The good news ………. oops there is now good news with this one.

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What is shiny, metallic and flying now?

Japanese beetle trap with floral lure and pheromone

Japanese beetle adult

If you guessed Japanese beetle – good job! Emily Hartwig (my summer student) and I put out our Japanese beetle traps yesterday and low and behold 24 hours later we have 11 and counting. I think we were early enough to catch the first adult flights and we will continue to monitor adult populations for the next month and report periodically on the status of Japanese beetles. Interestingly enough, we also had 2 European chafer adults in the trap first thing in the morning. I don’t think the traps are supposed to attract European chafer, so this must have been a fluke.

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Don’t leave home without it

Protection Guide for Turfgrass

The new OMAFRA Protection Guide for Turfgrass Publication 384 is now available online in English and French. It contains all of the pesticides (fungicides, insecticides and herbicides) registered for use on turf as of Dec. 2013. Information in this guide is for sod farmers, golf courses and contains information on Class 11 pesticide actives registered for use under the cosmetic pesticide ban in Ontario. Here is the link – http://www.ontario.ca/bwg3. This guide replaces the 2009 version of OMAFRA Publication 384 and the 2012 Suppliment. If you are interested in this publication you may also be interested in OMAFRA Guide to Nursery and Landscape Plant Production and IPM. Here is the link – http://www.ontario.ca/bwa5

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