Showing posts with label Beneficial Insects. Show all posts
Showing posts with label Beneficial Insects. Show all posts

Thursday, August 4, 2011

Second Dispatch from the Insect War Front

The Good:

Flowering mint covered in pollinators 
Herbs that are allowed to flower are generally very attractive to beneficial insects.  Earlier in the year, my flowering basil was inundated with beneficials.  Now it's the mint that is bringing them in.

Syrphid fly on flowering mint
Large syrphid fly (wasp mimic) on flowering mint
The mint is loaded with butterflies and syrphid flies (bee and wasp mimics) that serve as pollinators.  Some syrphid flies also have predatory larvae.

The Bad:

Black blister beetle eating tomato leaves
About a week ago, I found about 20 of these black blister beetles on the lower leaves of my tomato plants.  Blister beetles eat leaves and can defoliate a plant if their population is left unchecked.  They are called blister beetles because, when disturbed, they release a chemical blister agent that can cause chemical burns.  Because of this, I am not hand picking them off the plants.  This is the first time I've ever had a problem with this pest.  I've stalked them each morning and given them a quick shot of the organic insecticide NeemII.  That seems to be taking care of the problem just fine.

Cut worm beneath tomato plants
While volunteering at the heritage gardens at Prairie Grove Battlefield State Park, I hoed up this cutworm beneath the tomato plants.  Cutworms encircle plant stalks and can cut them off at the base or eat the outer layer which will cause wilting and death.  If you have a cutworm problem, wrap a small skirt of aluminum foil around the base of your plants and that will exclude them.  I don't have many cutworm issues, because I let my chickens dig through my soil at the end of the season and eat anything they find.  If you don't have chickens, removing any organic material such as mulch and turning the soil over will help.

Squash bug eggs on the underside of a butternut squash leaf
Two mating squash bugs on a butternut squash vine
Closeup of a squash bug on a butternut squash leaf
Squash bugs can be a real problem.  They reproduce rapidly and in large numbers can suck a vine dry.  In the picture directly above, you can see the piercing mouth part with a drop of plant juice on it.  Despite the pictures, squash bugs haven't caused a huge problem for me this year.  I haven't seen any nymphs (small, gray versions of the adults) and the most adults I've seen at one time is two.  I regularly check the undersides of the leaves for eggs.  When I find them, I scrape them off with my thumbnail.  I spray any adults I see with NeemII.

Tomato fruitworm on a Roma tomato plant
Tomato fruitworm
I found this tomato fruitworm on one of my plants this morning.  I picked it off and smashed it.  I haven't found any of the characteristic fruit damage or any other caterpillars.  If I start to find more, I will use a treatment of Bacillus thuringiensis (BT).  BT is an organic treatment of bacteria that only affects butterfly and moth caterpillars.

Japanese beetle on an okra leaf
I find 4 or 5 Japanese beetles eating my okra leaves each morning.  A quick spritz of NeemII and they are gone.

The Good and Ugly:

Wheel bug on an okra leaf

I have two of these rather large (1.5") insects living in my okra.  They are called wheel bugs and are easily identified by the spiky wheel on their backs.  These are GOOD insects to have around.  They are related to the squash bug, but instead of sucking juices from your plants, they use the large piercing mouth part to suck the juices out of other insects.  They are voracious predators of crop damaging insects, but if disturbed, they can deliver a painful bite.  So if you find them in your garden, leave them alone and be thankful they are there.

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Thursday, July 14, 2011

Weekly Gardening Outlook: Dog Days

This will be a continuing series where we look ahead at the coming week in gardening for the Northwest Arkansas area.

Chloe and chicks
Might as well get the bad news out of the way first.  After two years without harming a bird, the dogs killed two of my young hens.  They haven't bothered the full grown hens, but the little ones darting about apparently stimulated their inner carnivore.  I looked out the window and saw them bouncing around having a great time with one of the hens in Crash's (our male) mouth.  They were harshly reprimanded, shown the dead bird, and then reprimanded again whenever they showed interest in it.  I've kept them chained up when I'm not in the backyard.  It's going to be hard to trust them around the birds again.

Confined dogs
Insect Report:

Flea beetles on an eggplant
Flea beetles attack my eggplants every year, making the small holes in the leaves that you can see in the picture above.  Unless the population really gets out of control, they don't really seem to hurt the plants much.  They are interesting beetles in that, when disturbed, they can hop very quickly like the fleas they are named after.  A dose of neem oil mixed with pyrethrin (aka NeemII) gets rid of them.  These are both organic treatments.

Japanese beetles eating an okra leaf
Japanese beetles minutes after an application of NeemII
The Japanese beetles are out and trying to eat my green bean vines, apple trees, blueberry bushes, okra, basil, etc.  Above, you can graphically see the effects of the aforementioned neem oil/pyrethrin mix.  The beetles are only out for 3 weeks or so a year, so two or three applications spread over that time will keep them off of my crops.

Japanese beetle on sweet basil
Pyrethrin kills a broad spectrum of insects, including beneficial insects.  The way to protect beneficial insects is to target the beetles by applying it in the late evening after most beneficial insects have quit flying.  Pyrethrin is biodegradable and breaks down quickly when exposed to oxygen.  Neem oil on the other hand lasts for up to a week, but only kills insects that eat plant leaves.  

Butterfly on flowering sweet basil

These basil plants were treated with NeemII less than 24 hours before this picture and video were taken.  They are covered in butterflies and literally hundreds of hoverflies.  The video doeesn't fully capture the swarm of activity, but it's the best I could do.  It's important to use a pest management system that doesn't harm these beneficial insects.  Both butterflies and hoverflies are excellent pollinators (meaning more fruit for you) and the larva of many hoverflies eat harmful insects like aphids.  If I had just dusted these in Sevin dust, I would have destroyed both.

Caterpillar hiding in damaged onion leaf
Closeup of caterpillar in the onion leaf
Looking at my onions, I noticed the ends of a few leaves were missing.  Upon closer inspection, I caught this guy red-handed inside one of the leaves.  I believe it's a leek moth larvae.  I could treat the onions with Bacillis thuringiensis (BT), but after inspecting them closely I only found a few and the onions are nearing the end of their growing season anyway.  I'll just keep an eye on it for now and smash any that I find.  Interestingly, they have not affected my two-year-old evergreen bunching onions.

Garden Report:

Okra
The okra is still in the vegetative growing phase and has not put on fruit yet.  This variety (Perkins Long Pod) will get up to 5-6 feet tall with trunks as big around as my wrist before they are done.  You can see a definite size difference between the plants on the south (left) end of the bed and those on the north (right).  The plants on the north end get less sunlight because they are shaded somewhat by the plants to the south.

Tomatoes
Cherry tomatoes
Roma tomatoes
The Roma tomato plants may not get tall (~2 feet), but they are loaded with fruit.  None of which are ripe yet.  The cherry tomato plant (Super Sweet 100) has just begun to give a few ripe fruit.  Like the Romas, it is loaded with green fruit and blossoms.  No evidence of blossom-end rot this year.  The crushed egg shells (calcium) and straw mulch (conserving soil moisture) seem to be working.

Jalapenos
Bell peppers
The peppers are also loaded with fruit.  The straw mulch has really improved the health of my plants.

Flowering eggplant
No fruit on the eggplants yet, but they are putting on plenty of purple flowers.

Onions with an eggplant in the background
The onions are ready to harvest.  This is indicated when the foliage begins to fall down as seen above.  Click HERE for a previous post on harvesting and drying onions.

Young butternut squash
Butternut squash vine on a trellis
I have had such problems with squash vine borer (SVB) in the past, that the only squash I'm growing this year is the butternut squash.  Butternut squash is said to be resistant to the SVB.  So far so good.  The vines are 3-5 feet long and are growing up my cattle panel trellises.  

Swiss chard
The chard is doing what chard does.  It's growing with little care or maintenance.  Such a great crop.

Purple-podded pole beans on a trellis
The pole beans are 3-4 feet long and have yet to flower.  The only problem I've had with this variety in the past is with Japanese beetles defoliating them.  I have the NeemII ready...

Turnip
The warm season growing of turnips has been a huge success.  No maintenance and they are ready to harvest.

New growth on the apple tree
The apple tree is putting on some new growth after being hit hard by cedar-apple rust.  I've treated it with Serenade and this is a promising sign.  I plan preventive treatments next spring starting in April.

Blueberry bush
The two blueberry bushes are growing gangbusters.  I mulched them with straw and that seems t have really helped keep the pots from drying out between waterings.

Dead strawberry plants
Speaking of drying out between waterings, the lack of rain combined with 100 degree temperatures and my neglect have killed about two-thirds of my strawberry plants.  The cinderblocks being porous and having one side exposed to air, dry out easily.  They are easily harvested because of the accesibility, but be aware of the drawback to planting inside the cinderblocks.  Being the low maintence gardener that I am, I am ok with this.  The strawberry plants that remain can obviously handle drought better than those that died off, so as the years go on, the genetics of my plants will exhibit drought tolerance.

Jerusalem artichokes (sunchokes)
Amongst those weeds is a stand of sunchokes about 4 feet tall.  They will put on a beautiful display of small yellow flowers in a month and after it freezes, I will harvest the potato-like tubers.


Chicken and Egg Report:

Juvenile laying hen next to a juvenile meat bird
Again, the size differential between these birds who were born the same day and fed the same feed is astounding.

2"x4" wire barrier
The white cornish/rock meat birds have become so heavy that they cannot haul themselves back up the ramp to get to the food and water.  I put a 2"x4" wire mesh across the end to keep them up top, while allowing the hens access to the nest boxes.  The hen's production has leveled off to about 4 eggs per day.

Out in the proverbial cold
When I put the wire in a week ago, more than half of the egg laying chicks were able to squeeze through the wire and come and go as they pleased.  Just a week later, they have grown such that only two of them can still fit through.  The ones that can't fit through, spend their days foraging in the yard for insects, worms, and vegetation.  We've mysteriously lost two more of them (down to 7).  I can't blame the dogs.  Since I found no feathers or other remains, my money is on hawks.  I'm going to let the dogs run free again as a deterrent to the hawks.  We'll see how that goes.

Weather Outlook:

-We finally got a break from the heat and got a little rain to boot!  Temperatures will remain in the mid to upper 90s this week with little further chance of rain.  Keep your gardens watered.

What's Being Harvested:

-Cherry tomatoes
-Turnips
-Herbs
-Serrano, jalapeno, and bell peppers
-Green, yellow, and purple onions

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Wednesday, April 27, 2011

Weekly Gardening Outlook: Rain, Rain Go Away!

This will be a continuing series where we look ahead at the coming week in gardening for the Northwest Arkansas area.

Well.  That was a lot of rain.  Northwest Arkansas got 15" of rain in a few days, resulting in the biggest flood I've seen in my 14 years here.  Check out the pictures HERE.  You can compare the picture of the dam at Devil's Den State park to my recently posted picture.  Let me take this opportunity to brag on the raised bed system.  Unlike in-ground beds where water can sit for days and smother plants, my raised beds were drained within an hour of the rain stopping.

Hoverfly on an onion flower
Honey bee on an onion flower
In addition to the normal honey bees, I spotted a hoverfly in the garden recently.  These beneficial flies are often colored like bees, but are harmless to humans as they do not bite or sting.  They are pollinators as adults and some larvae eat soft bodied pest insects like aphids or stink bugs.  HERE is a study showing the connection between plantings of attractive plants, hoverflies, and a decrease in pest insect populations.  HERE is a link with lists of attractive plantings for various beneficial insects.  Consider planting things like dill, fennel, or parsley to make your garden more attractive to these unpaid mercenaries in the fight against pests.

Onions, arugula, cilantro, and flowering bok choy
Week old onions (purple and yellow)
Bolting bok choy
The onions and herbs are doing great.  The bok choy bolted quickly and is quite bitter.  That just goes to show you that buying plants on a whim doesn't usually work out. 

Arugula after harvest
Fresh picked arugula leaves
I recently harvested the center leaves from the arugula as an addition to our dinner salad.  I really enjoy the nutty flavor that it adds.

Strawberries
Strawberry runners
The first harvest from the strawberry plants is close.  If you have strawberry plants, be sure to be removing the runners right now to increase fruit production.

Blueberry flowers
The two remaining blueberry bushes are flowering nicely.  Hopefully they will set fruit.

Chicken and Egg Report:

We are getting five eggs a day from our backyard flock of 6 hens.  The person that took us up on our recent offer to help get a backyard flock going has obtained six 2 month old chickens.  On Friday, we will be rehabbing an old children's playhouse to serve as a chicken coop.  Look for upcoming posts about that.

Weather Outlook:

-Look for a break in the rain for the next two days and then another chance of rain this weekend.  Expect typical spring temperatures of between 40 and 75 degrees.
It's still a little too cool to plant warm season crops outside like tomatoes, eggplant, squash, or cucumbers.

What's Being Harvested:

-Herbs
-Arugula