Crovect, what have I done wrong ?

[Free range Rob]

So, turned lambs out 8 weeks back, 9th of June I treated everything with crovect.
One stripe up back of each leg and one down the back as per instructions.
Checking today I saw a couple didn’t look right so caught them, only to find maggots.

set up the race and ran them all through, 17 out of a pen of 30 had maggots, two were really quite bad.

was I wrong to assume the crovect would have me covered

 

[glasshouse]

So, turned lambs out 8 weeks back, 9th of June I treated everything with crovect.
One stripe up back of each leg and one down the back as per instructions.
Checking today I saw a couple didn’t look right so caught them, only to find maggots.

set up the race and ran them all through, 17 out of a pen of 30 had maggots, two were really quite bad.

was I wrong to assume the crovect would have me covered

Only last 8 weeks

 

[Free range Rob]

Only last 8 weeks

Only been done 4

 

[Lynemorebf]

My experience of using crovect for fly prevention is the same, it doesn’t do the job. Will deter the flys for a couple weeks but after that it’s hopeless. Click is the only product I’d use now with the safe piece of mind it works for the duration of the season. It’s expensive yes but it does the job. With the crovect you’ve now had an extra handling and stock have been impacted with the flys so completely counter productive.

You’ve done nothing wrong - product has let you down. Get click on when you can

 

[shearerlad]

Only last 8 weeks

Only 4 weeks since treatment

@Free range Rob crovect only protects from fly strike where the chemical is on the wool, unlike clik and dysect that moves to cover the whole body

 

[Stewartry hill]

6 weeks is about the time for crovect

 

[Free range Rob]

My experience of using crovect for fly prevention is the same, it doesn’t do the job. Will deter the flys for a couple weeks but after that it’s hopeless. Click is the only product I’d use now with the safe piece of mind it works for the duration of the season. It’s expensive yes but it does the job. With the crovect you’ve now had an extra handling and stock have been impacted with the flys so completely counter productive.

You’ve done nothing wrong - product has let you down. Get click on when you can

Thank you, re assuring knowing it’s not me that screwed up, first time I’ve had issue like this and was not best pleased,
Will be giving crovect a swerve in future

 

[Free range Rob]

6 weeks is about the time for crovect

Ok, I was expecting it to see me through past end of July when they will hopefully be gone.

Only 4 weeks since treatment

@Free range Rob crovect only protects from fly strike where the chemical is on the wool, unlike clik and dysect that moves to cover the whole body

cheers, considering this was all back end where they had been done, or at worst only an inch or two away I was a bit miffed, I won’t be using crovect again that’s for sure, waste of my time and money having to go through them all again after less than a month

 

[glasshouse]

Thank you, re assuring knowing it’s not me that screwed up, first time I’ve had issue like this and was not best pleased,
Will be giving crovect a swerve in future

Ctovect is for treating maggots primarily, not prevention

 

[liammogs]

If I remember rightly crovect will only protect where it it's sprayed and click will work all through the wool, if you want the same type of cover like click but not the same withdrawal youve got clickzin!!

Dont ask me where I heard it but I do remember a demonstration one day somewhere with a guy saying click for prevention and crovect for treatment

 

[neilo]

Ok, I was expecting it to see me through past end of July when they will hopefully be gone.

cheers, considering this was all back end where they had been done, or at worst only an inch or two away I was a bit miffed, I won’t be using crovect again that’s for sure, waste of my time and money having to go through them all again after less than a month

If they're (or were) that close to going, I'd use Crovect again.
Sprayed over the affected areas it will kill the maggots, and it has a short withdrawal period.

Otherwise, Clikzin has a much shorter withdrawal than Clik, but it won't kill existing maggots (same as Clik).

 

[ladycrofter]

We use Spot on and Flyoff (cheap crovect) together. Each does what the other doesn't.
Weird because they're both types of cypermethrin IIRC.

 

[Man_in_black]

@Free range Rob out of interest, what made you choose crovect for prevention? As others have said, I only ever see crovect as a treatment for established strike (we actually use molecto now same difference). On smaller lambs & ewes clik extra & on shorter keep clikzin. The clever bit in them is the "fleece bind" which spreads it through out the fleece ( X amount of hours rain free) whereas crovect/molecto are literally just where it's applied.

 

[tepapa]

I was under the impression that the likes of Crovect don't like variable and wet Weather and longevity is reduced. Does it not say something on the data sheet?

 

[delilah]

Would never entertain using crovect as a preventative, its strong stuff and should be used sparingly ie topical application on maggots. Clikzin plenty strong enough as a preventative.

As an aside, we went in heavy with garlic licks and red top fly traps this season, didn't use any preventative prior to shearing.

 

[Northeastfarmer]

Click is the only thing to use

 

[Man_in_black]

Click is the only thing to use

To be fair dysect is very effective, time it right and it covers traditional fly season. And it has added benefits that it will treat established strike, unlike clik. But it's definitely nastier stuff & can't leave it in the rubber pipe over winter.... I know that now!

 

[Northeastfarmer]

To be fair dysect is very effective, time it right and it covers traditional fly season. And it has added benefits that it will treat established strike, unlike clik. But it's definitely nastier stuff & can't leave it in the rubber pipe over winter.... I know that now!

I wouldn’t touch dysect

 

[glasshouse]

Only been done 4

Misread post

 

[Jackov Altraids]

Ok, I was expecting it to see me through past end of July when they will hopefully be gone.

cheers, considering this was all back end where they had been done, or at worst only an inch or two away I was a bit miffed, I won’t be using crovect again that’s for sure, waste of my time and money having to go through them all again after less than a month

Did you spray the crovect on in a race?

As said, it only works where the spray lands, You will not generally cover the back of the legs well enough as they run though the race. I start by standing behind and cover the back end completely and this seems to work.