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-   -   Hop Pests ID thread: Pics, descriptions and solutions (http://www.homebrewtalk.com/f92/hop-pests-id-thread-pics-descriptions-solutions-80510/)

conpewter 09-15-2008 04:35 PM

2 Attachment(s)

I had japanese beetles this year and caused me all sorts of headache (I killed them with Sevin but then my hops were attacked by spider mites since I killed off their natural predators with Sevin).

I flicked them off the plants as well but next year my trellis will be much higher so that won't be an option so I'm still investigating. I'm going to put down Milky Spore or beneficial nematodes this fall or upcoming spring but that will only take care of my yard, they'll still fly over from neighbors yards.

I read that you can use neem oil on the plants and that will deter the beetles for a few days. Also looking into a product that you put in the soil and the plants pull it up into the leaves and that will deter the beetles, I'm still trying to remember the name of it (was shown it at Menards) but I'm betting it won't be useful for a food crop like hops.

I'll try to find some pictures of spider mites. I used Mite-X on them and it screwed up my hops, cones and leaves all turned brown before harvest (I did get some useful fuggles).

I can't find pictures of my spider mites, so I found some online attached below.

They say planting garlic will keep spider mites away, but it didn't do it (got a nice crop of garlic though). My plan next year is to continue to plant garlic, but also find some plants that ladybugs like and plant those around the hops as well, ladybugs will apparently eat aphids and mites.


conpewter 09-15-2008 04:35 PM

2 Attachment(s)

I had japanese beetles this year and caused me all sorts of headache (I killed them with Sevin but then my hops were attacked by spider mites since I killed off their natural predators with Sevin).

I flicked them off the plants as well but next year my trellis will be much higher so that won't be an option so I'm still investigating. I'm going to put down Milky Spore or beneficial nematodes this fall or upcoming spring but that will only take care of my yard, they'll still fly over from neighbors yards.

I read that you can use neem oil on the plants and that will deter the beetles for a few days. Also looking into a product that you put in the soil and the plants pull it up into the leaves and that will deter the beetles, I'm still trying to remember the name of it (was shown it at Menards) but I'm betting it won't be useful for a food crop like hops.

I'll try to find some pictures of spider mites. I used Mite-X on them and it screwed up my hops, cones and leaves all turned brown before harvest (I did get some useful fuggles).

I can't find pictures of my spider mites, so I found some online attached below.

They say planting garlic will keep spider mites away, but it didn't do it (got a nice crop of garlic though). My plan next year is to continue to plant garlic, but also find some plants that ladybugs like and plant those around the hops as well, ladybugs will apparently eat aphids and mites.


mlints 06-15-2011 07:02 PM

Hop Merchant
 
2 Attachment(s)

I found these critters chewing holes in the leaves of my second-year plant. I believe it's the caterpillar of the Eastern Comma butterfly, also known as the Hop Merchant. They hang out on the undersides of the leaves. So far, the plant seems to be outgrowing the damage, but I've been hand-picking the ones I can reach just to be on the safe side.


mlints 06-15-2011 07:02 PM

Hop Merchant
 
2 Attachment(s)

I found these critters chewing holes in the leaves of my second-year plant. I believe it's the caterpillar of the Eastern Comma butterfly, also known as the Hop Merchant. They hang out on the undersides of the leaves. So far, the plant seems to be outgrowing the damage, but I've been hand-picking the ones I can reach just to be on the safe side.


bristela 06-16-2012 03:49 AM

3 Attachment(s)

I've found a beetle (obviously don't know if it's always the same one) after dark chewing away at my hop leaves. I've never seen it during the day and there's always only one. I've included a pic as well as one of the kind of damage I think it's causing. I've also seen leaf damage similar to that shown here but always put it down to snails as it's always restricted to the lower leaves and I've only every found the beetle at about head height. The beetle always looks like it's chowing down on the entire leaf whereas the snails don't seem like they would manage the thicker veins. I've included an example of what I'm talking about. I've got several more pics of pests on my hop growing blog. I'm presuming that the beetle is a Japanese one even though the segment behind its head isn't green, like in the pictures I find with a google image search.

Quote:
Originally Posted by Zymurgrafi View Post
Japanese beetles are a pretty common pest it seems. I picked them off all summer. Unfortunately nw that I have decided to document them I cannot find a single one to photo. So if anyone has a pic let me know.

Here is what they do...


Best way to deal with them is to pick them off every morning. They are slow in the morning and you can flick them into a container of dishsoap and water. As the day warms up they are harder to catch and will fly away. You can use traps but often the traps will attract more beetles than they catch.

Another preventative measure is to purchase beneficial nematodes and work them into the ground in the late spring/ early summer. These are organisms that will eat the over wintering grubs that will hatch into beetles. They won't stop adult beetles. If you have beetles one year it would probably be a good idea to do this the next season.

bristela 06-16-2012 03:49 AM

3 Attachment(s)

I've found a beetle (obviously don't know if it's always the same one) after dark chewing away at my hop leaves. I've never seen it during the day and there's always only one. I've included a pic as well as one of the kind of damage I think it's causing. I've also seen leaf damage similar to that shown here but always put it down to snails as it's always restricted to the lower leaves and I've only every found the beetle at about head height. The beetle always looks like it's chowing down on the entire leaf whereas the snails don't seem like they would manage the thicker veins. I've included an example of what I'm talking about. I've got several more pics of pests on my hop growing blog. I'm presuming that the beetle is a Japanese one even though the segment behind its head isn't green, like in the pictures I find with a google image search.

Quote:
Originally Posted by Zymurgrafi View Post
Japanese beetles are a pretty common pest it seems. I picked them off all summer. Unfortunately nw that I have decided to document them I cannot find a single one to photo. So if anyone has a pic let me know.

Here is what they do...


Best way to deal with them is to pick them off every morning. They are slow in the morning and you can flick them into a container of dishsoap and water. As the day warms up they are harder to catch and will fly away. You can use traps but often the traps will attract more beetles than they catch.

Another preventative measure is to purchase beneficial nematodes and work them into the ground in the late spring/ early summer. These are organisms that will eat the over wintering grubs that will hatch into beetles. They won't stop adult beetles. If you have beetles one year it would probably be a good idea to do this the next season.

bristela 06-16-2012 03:49 AM

3 Attachment(s)

I've found a beetle (obviously don't know if it's always the same one) after dark chewing away at my hop leaves. I've never seen it during the day and there's always only one. I've included a pic as well as one of the kind of damage I think it's causing. I've also seen leaf damage similar to that shown here but always put it down to snails as it's always restricted to the lower leaves and I've only every found the beetle at about head height. The beetle always looks like it's chowing down on the entire leaf whereas the snails don't seem like they would manage the thicker veins. I've included an example of what I'm talking about. I've got several more pics of pests on my hop growing blog. I'm presuming that the beetle is a Japanese one even though the segment behind its head isn't green, like in the pictures I find with a google image search.

Quote:
Originally Posted by Zymurgrafi View Post
Japanese beetles are a pretty common pest it seems. I picked them off all summer. Unfortunately nw that I have decided to document them I cannot find a single one to photo. So if anyone has a pic let me know.

Here is what they do...


Best way to deal with them is to pick them off every morning. They are slow in the morning and you can flick them into a container of dishsoap and water. As the day warms up they are harder to catch and will fly away. You can use traps but often the traps will attract more beetles than they catch.

Another preventative measure is to purchase beneficial nematodes and work them into the ground in the late spring/ early summer. These are organisms that will eat the over wintering grubs that will hatch into beetles. They won't stop adult beetles. If you have beetles one year it would probably be a good idea to do this the next season.

ColumbusAmongus 06-16-2012 04:48 PM

1 Attachment(s)
Quote:
Originally Posted by RyanN
Not sure what type of caterpillar this is but it was definitely eating the leaf. I found it on a Centennial.
This I think is a question mark butterfly. These guys are my nemesis. They cycle twice a year on mine. The butterflies come in the spring and lay little green eggs that stack on top of each other. Several caterpillars come out and eat cones and leafs. They are
Black at first then get lighter and develop yellow spiney things. They make these leafy looking chrysalis under my deck that look like so and the new butterflies come out and lay eggs for a second cycle.

KeyWestBrewing 06-21-2012 03:18 PM

3 Attachment(s)

I don't think it's powdery mildew and the weather I've been having fits the needs for downy to start. Only the undersides have been getting it but nothing ever on top. When I spray them off there's tiny black dots left behind underneath where the fungus was growing. And whatever it is it did start showing up on a few of my hops leaves. It just poured so I didnt see anything on my hops this time, hopefully it stay that way. I hate that stuff any leaf that has any bit of it dies the next day. Heres a few pics of what it did to my pepper plant...


KeyWestBrewing 06-21-2012 03:18 PM

3 Attachment(s)

I don't think it's powdery mildew and the weather I've been having fits the needs for downy to start. Only the undersides have been getting it but nothing ever on top. When I spray them off there's tiny black dots left behind underneath where the fungus was growing. And whatever it is it did start showing up on a few of my hops leaves. It just poured so I didnt see anything on my hops this time, hopefully it stay that way. I hate that stuff any leaf that has any bit of it dies the next day. Heres a few pics of what it did to my pepper plant...



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