Aphids

Blackwater boy said:
Considering the exceptionally mild autumn and winter and how calm it was and all the early sowing in Amazed there is not more bydv around in barley and wheat
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Your thoughts were correct,

It’s a good few years since I remember seeing BYDV as bad as it is in winter crops (barley & wheat) down here.

In my view, there were two infection periods (Autumn & January).
Anything that wasn’t sprayed in autumn with an aphicide (no September planting down here) is destroyed with Virus, bad dwarfed patches.
Many of the crops that were sprayed are now showing a lot of yellow leaves across them but no patches or dwarfing (this looks like a brief infection event in January).

It’s a pity as there will be yield loss (I’m sure the January only effected crops won’t be as severely hit but it will surely take from them too).

I like growing roses in the garden, the climbing roses in particular get hit with aphids, whitefly and what I think is a sawfly larvae. I’ve tried various chemicals (dimethoate, karate etc) but they did very little if anything. Last year I discovered that Aphox does a great job on the pests. 0.5g in 1 litre of water rids them of the pests without any obvious harm to the plant.

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Received first aphid counts back from the aphid trap here. Very low levels despite being by the sea. This count would be based on mid April.

Surprising given the weather and amount of BYDV in winter crops.

Another sample gone off yesterday for previous two weeks so we’ll see what shows.
 
Crops said:
Received first aphid counts back from the aphid trap here. Very low levels despite being by the sea. This count would be based on mid April.

Surprising given the weather and amount of BYDV in winter crops.

Another sample gone off yesterday for previous two weeks so we’ll see what shows.
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Is it possible to tell what quantity are virus carrying?
 
Crops said:
Your thoughts were correct,

It’s a good few years since I remember seeing BYDV as bad as it is in winter crops (barley & wheat) down here.

In my view, there were two infection periods (Autumn & January).
Anything that wasn’t sprayed in autumn with an aphicide (no September planting down here) is destroyed with Virus, bad dwarfed patches.
Many of the crops that were sprayed are now showing a lot of yellow leaves across them but no patches or dwarfing (this looks like a brief infection event in January).

It’s a pity as there will be yield loss (I’m sure the January only effected crops won’t be as severely hit but it will surely take from them too).

I like growing roses in the garden, the climbing roses in particular get hit with aphids, whitefly and what I think is a sawfly larvae. I’ve tried various chemicals (dimethoate, karate etc) but they did very little if anything. Last year I discovered that Aphox does a great job on the pests. 0.5g in 1 litre of water rids them of the pests without any obvious harm to the plant.

View attachment 106711View attachment 106712View attachment 106713
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This interests me as I haven't used an aphicide in a few years now. The last time I used them I got very badly dwarfed so I went with the idea that I'd rather have a balanced eco system. And I haven't had an issue since I stopped up until this year of course. Winter barley got an awful yellowing but it only dwarfed a very small amount of it that was near a wood. I didn't know there was two types of bydv. The crop looks really good still in 90% of the area. The temptation of course was there to break it with the spring crops but I've held my nerve and look to be ok. My question I suppose would be is there any predators in the fields during the winter at all that it might just be better to use the insecticide
 
Jon1 said:
This interests me as I haven't used an aphicide in a few years now. The last time I used them I got very badly dwarfed so I went with the idea that I'd rather have a balanced eco system. And I haven't had an issue since I stopped up until this year of course. Winter barley got an awful yellowing but it only dwarfed a very small amount of it that was near a wood. I didn't know there was two types of bydv. The crop looks really good still in 90% of the area. The temptation of course was there to break it with the spring crops but I've held my nerve and look to be ok. My question I suppose would be is there any predators in the fields during the winter at all that it might just be better to use the insecticide
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Believe it or not but there are actually 3 types of BYDV (PAV, MAV & RPV). PAV is the most common I believe.

The different symptoms I mentioned above are more likely to be related to when the infection occurred rather than the type of BYDV. The earlier the infection you get (Autumn versus January), the more dwarfing you’ll get and the higher the yield loss.

The general thing with predators is while they do kill aphids, the number of predators increases when aphid numbers are high but there’s a time lag and the damage will have been done by the time the predator numbers have risen.
If predators were that useful in the environment, I’d imagine that aphids should be extinct…..
 
Crops said:
Received first aphid counts back from the aphid trap here. Very low levels despite being by the sea. This count would be based on mid April.

Surprising given the weather and amount of BYDV in winter crops.

Another sample gone off yesterday for previous two weeks so we’ll see what shows.
Click to expand...
I taught They said at the spring crop walk 2 weeks ago that aphid numbers were very high in the tower in mogeely.
 
Blackwater boy said:
I taught They said at the spring crop walk 2 weeks ago that aphid numbers were very high in the tower in mogeely.
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Yes, to be honest I was surprised as I thought numbers were/should be high too.
Maybe it’s just a sampling error.
That said, BYDV symptoms are beginning to show in spring barley here and it looks to me to be at a very low level at present.
 
Jon1 said:
This interests me as I haven't used an aphicide in a few years now. The last time I used them I got very badly dwarfed so I went with the idea that I'd rather have a balanced eco system. And I haven't had an issue since I stopped up until this year of course. Winter barley got an awful yellowing but it only dwarfed a very small amount of it that was near a wood. I didn't know there was two types of bydv. The crop looks really good still in 90% of the area. The temptation of course was there to break it with the spring crops but I've held my nerve and look to be ok. My question I suppose would be is there any predators in the fields during the winter at all that it might just be better to use the insecticide
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I'm the same here.
Haven't used a aphidicide in a few years
Walking yesterday and there's loads of ladybirds in the fields, no real signs of bydv
 
headcase said:
I'm the same here.
Haven't used a aphidicide in a few years
Walking yesterday and there's loads of ladybirds in the fields, no real signs of bydv
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I think the argument that the predators take time to build up causing disease spread can be rebuked by the follow up that your field can be repopulated by the breeze the day after you have carpet bombed your farm with an insecticide 🤷🏾
I got bydv this year but it hasn't affected the crop as badly as in the past.
 
One positive result of the bad spring weather is that it appears to have resulted in low aphid numbers.

I had felt that any crop of April sown barley I looked in had very low numbers and they were hard to find.
A few yellow plants are turning up now but the percentage is minuscule.

A couple of Teagasc technicians were here today checking for aphids and they confirmed that numbers were very low.

Interestingly, many of the early sown (Feb) crops have a lot of BYDV. Aphid numbers must have risen during the benign month of February but were knocked back during all the wet weather in March.

Now that temperatures are high, numbers will increase quickly putting the very late barley at risk.
 
I am still kinda kicking myself that I didn’t plant the barley late Feb or early March like a few neighbours did. Instead I waited till 20th and 21st April. I must have a better look over the hedge and see how the neighbours barley is doing after reading that.
 
KTM 450 said:
I am still kinda kicking myself that I didn’t plant the barley late Feb or early March like a few neighbours did. Instead I waited till 20th and 21st April. I must have a better look over the hedge and see how the neighbours barley is doing after reading that.
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I would not be. As Crops says plenty of it around here has yellow leaves through it.

I have seen some of those crops with awns appearing as well so I do wonder about yield potential (or lack of).
 
nashmach said:
I would not be. As Crops says plenty of it around here has yellow leaves through it.

I have seen some of those crops with awns appearing as well so I do wonder about yield potential (or lack of).
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Those planted early on real kind and free draining land are really nice and will definitely out yield the late April stuff but there are plenty fields that were not fully fit or maybe low lying or flat and these are patchy alright, a few lads got carried away with that roller and made a balls of headlands etc too.
 
nashmach said:
I would not be. As Crops says plenty of it around here has yellow leaves through it.

I have seen some of those crops with awns appearing as well so I do wonder about yield potential (or lack of).
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Kinda time for those early planted ones to have awns starting to appear???? 11-12 weeks planted most would be.
 
Walked some of the oats this eve, there’s a couple of aphids to be found. I will aim to spray towards weekend, it’s not mad cold yet I would think.
 
Crops are probably under enough stress without additional stress with herbicides and aphicide?
Tempted to spray but we didn't.
 
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