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Medium_pawpaw_leaf_mould Spray bottle keeps blocking, what to do?

I have a black spot mould all over the underside of my red papaya tree leaves. I've bought the copper spray – Yates Leaf Curl Copper Fungicide, which was what the bloke at Bunnings suggested. After my small spray bottle kept clogging every five seconds, I went back and bought a larger 2 litre pressure sprayer hoping the nozzle might be larger. It lasted longer, but the same problem, it keeps blocking. Should I be using a specific type of sprayer, that can handle the viscosity of the mixed fungicide, without continually blocking?

Also, I notice that the underside of the leaves especially, where the main spotted mould problem exists, doesn't seem to take the fungicide easily. Should I use a surfactant with this fungicide? The tops of the leaves seem to accept it more easily than the underside.

Submitted: 11:15AM, 22 May 2015
Answer: Nozzle clogging is a common problem when using powdered copper products. Try using Yates Liquid Copper Fungicide. This product is 100% water soluble, its ultra-fine particles combine with water to create an aquagel that sticks firmly in place. The product passes readily through sprayer nozzles so there is no risk of it clogging.
Category: Diseases
Answered: 12:29PM, 22 May 2015

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