Lily Leaf Beetle Control

Wednesday, June 1, 2011

81° here after a high at 3 PM of 85.2°. The wind has been a steady 7 mph for half an hour now and the humidity is at 76%. We had a brief but intense thunder storm at 2 PM and a few rumbles since then. The national news reports serious storm considerations in Amherst and Northampton, Massachusetts.

Over the years Gail and I have grown thousands of lilium. That all came to an end four years ago as the lily leaf beetle got a foothold in Vermont and the time and expense for control were more than we wanted to contribute. Since that time, research at the University of Rhode Island has made some progress using parasitic wasps. When I first learned of this research perhaps six years ago I was encouraged by the benefit but discouraged by the fact that the parasitoids would not survive in zone 4 Vermont.

I'd like to refer lily lovers to a URI site that will help with some info on the success to date. If you have personal information or success with products or beneficials, please share with other gardeners. The site is forwarded to me by Lisa Tewksbury, URI Research Associate. As she points out, there are ongoing studies other lily growers may be interested in helping with.

Writing from the mountain above Peacham Pond where another t-storm is forming.

George Africa
The Vermont Gardener
Vermont Flower Farm
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At VFF we'll happily help you GROW your GREEN THUMB!

Lily Thoughts

Monday, April 5, 2010

Gray sky and 32 degrees this morning here on the mountain. Some different than yesterdays 60 degree start and 73 degree finish. Gail and I were rolling up plastic just after noon and the wind gusts were so strong that the two of us could hardly control the 60 foot pieces. Today is a different day and it will be colder as the next three days have promised some rain.

This weekend was beautiful but the hot weather warmed the soil quicker than I thought and I have already received reports of the first hatch of the lily leaf beetle. If you like lilium you have to get control of this beetle early in the season. Even then they might fly in and start a new generation of trouble.




I have written about the beetle on this blog and also on my disbanded Vermont Gardens. In the search bar in the upper left of the main blog pages just type in lily leaf beetle and you will get all the scoop. You can also Google lily leaf beetle for plenty of results. Many other gardeners are writing too and I do hope someone will come up with an organic solution that helps us out. Please, oh, please try to avoid Imidachloprid--we are already having enough trouble with loss of honey bees.







Hope these pictures help with your identification. The pictures of the beetle as an adult and as larva almost ready to bury in. They are difficult to confuse with other insects. Hand picking is not easy as they drop to the ground at the sight of an approaching hand and in nano seconds become invisible. Good luck!

Writing from the mountain above Peacham Pond where the sun is getting stronger like the voices of the tom turkeys.

George Africa
The Vermont Gardener
Vermont Flower Farm

Beat the Rain, Beat the Beetles!

Saturday, May 16, 2009

A quick morning walk with Karl the Wonder Dog made me happy about how well the hostas are doing (Pacific Blue Edger pictured here) but dismayed about the state of lilies east of the Rockies and on into Canada. The lily leaf beetle has taken control and a predator wasp which is successful in zone 5 just doesn't do the trick here. It's too cold for it to survive.

If you search my blogs from last year you'll see some comments and some solutions but the battle is a big one and here in Vermont there are at least 3 generations per year so you have to love your lilies a lot to help them through the disaster. I'd say 3-4 people a day stop at the nursery and ask for advice. Click on the pictures and get a better look at the beetles--about 3/8's of an inch long.

I have to get clicking here myself because I'm trying to beat the rain. I'm putting a new roof on Gail's mother's house so we can sell it and the rain in recent weeks has slowed me down. I have the sun room roof stripped and will add some more insulation inside and then top it off. Rain is coming after lunch so time is short.

If you are out and about today, the wild flowers are still beautiful around here. Painted trillium are out down the road. At the nursery where we rototilled last fall for the new hosta and shade garden, millions of blue and also white forget me nots grew. We never saw them before but they are bountiful. I won't be at the nursery today but Gail is there so stop and say hello if you have a minute. We're working our way out of "spring disarray" so Gail may need a minute to locate what you want but we do have a nice selection.

Writing from the mountain above Peacham Pond where tom turkey just chased 6 hens by my window. Turkey life is good!

George Africa
The Vermont Gardener

Vermont Flower Farm Visit virtually if you can't stop by in person
Vermont Gardens

Lilies, Oh My Lilies!

Sunday, June 24, 2007

A great morning here at Vermont Flower Farm and a good day to get out and visit nurseries in your area. Flowers are popping right and left and even though we have had some strong winds and hard rains of late, things look great. Today's weather is much improved over yesterday. I spent ten hours on the tractor on our new property on Route 2 and I'll be heading back there in a few minutes. Yesterday was one of those "coat on, coat off" days. The 42 degrees at 5 AM took a long time to get to 60 and every time the cloud cover moved in, we were back to wind and low fifties.

Karl the wonder dog and I made our 5 AM walk this morning and were bothered that a young deer, only one, decided to visit the lower hosta garden for a late night/early morning snack. Two hostas I really like were on the menu: Rascal and Alex Summers. A few others such as Inniswood and Revolution lost a leaf or two.

I tracked the deer through the peony garden and into the back field. It spent some time finding a piece of fence that looked like it had a big enough space to scoot under. As soon as the fawns are able to run with their moms, the deer head to our hosta heaven and try to find leaves that I haven't sprayed with TreeGuard. It's a great product but not worth much when it's still in the jug. I have been too busy to spray but that has to happen by nightfall. Hostas turn into "deer lettuce" this time of year and you have to keep the deer from thinking it's the best eating crop available.

Before I head out of here I want to ask that you go out today and check all your lilium. If you know Gail and me, you know that we have grown tens of thousands of lilium over the years. We have dozens of customers who have better collections than we ever had because they purchased and cared for new bulbs from Vermont Flower Farm. The current problem is a big one so please listen and look well.

As our climate changes, our lands our invaded by more and more insect life from afar. In 1992, a very destructive, small red beetle, the lily leaf beetle, Lilioceris lilii, entered the east coast at Boston. This picture from the University of Rhode Island isn't the greatest but try http://bugguide.net for some other pictures.

Our insect communication was not all that good because the beetle actually entered Montreal in the mid forties, fifty years before we might have shared that information. It immediately began its migration south and east. The various lily listservs I subscribe to have now documented the bug in all parts of the US east of the Rockies and now through Nova Scotia.

The reason I am mentioning this beetle today is that the beetles were visible three weeks ago and by now, the first set of eggs have no doubt hatched and the larvae should be obvious if you haven't taken any counter measures. Here's a larvae picture I took last year.


If you do not eliminate the beetles and the larvae by either hand picking or some chemical or organic means, this is what your stem of lilies looks like in short order.


So the question is "Control". The research funded by the North American Lily Society resulted in a recommendation of a parasitic wasp. That's fine but it's questionable if the wasp will live in Vermont and similar climates and production never even started. The second recommendation was Neem oil spray. This works well, is very expensive and has to be reapplied several times. A friend of ours in Burlington has been using dormant oil spray for years and even though he lives in a well established pocket of lily beetles, he has never had a problem.

I followed friend David's suggestion and went one step further and bought a light weight dormant oil with a built in fungicide and miticide. Remember, this stuff is made for fruit trees and people in the industry only know it as being used for that. I sprayed early after seeing a few beetles which I presumed probably had already layed some eggs. To date there has not been any hatch and if there was, the oil prevented the eggs from developing. Is this accurate? I think so, but we have lots of gardens and I only sprayed the lilies I saw on the first passing. To continue with the study, I have sprayed gardens of two friends. One is a half mile from here and one is 3.5 miles from here. One had noticed beetles, one had not. Neither has larvae yet. I also gave some oil to a friend in Morrisville and it appears to be working there too.

Please do some careful inspection today and if you find beetles, please let me know. Sevin has been recommended but that is a spray which kills the good bugs and beetles too and I am a butterfly man so I'm reluctant to get carried away with that stuff. A friend in White River said the price just went up as the announcement of the beetles ran in the local paper. Similar stories abound. A month ago, another friend asked the Dept of Ag to comment and they kind of did a "what beetle?" response. That would not be the case today. So-o-o-o if you want some good looking lilies like this Uchida (below) do a through inspection and formulate a control plan today.

And since this picture just came through from http://bugguide.net print it off and put it on the fridge. With luck, it will be the only one you'll see. Unfortunately, I fear for the worse as I think this beetle is here to stay.



Writing from the mountain above Peacham Pond where a trailer of canoes and kayaks just went by--probably heading out on the water to check on the loon population. As for me, I heading into the garden and then out onto the tractor. Enjoy your gardens, stop by for a visit! Ask us a garden question!

George Africa

http://vermontflowerfarm.com

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