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Hot, humid, and wet describes the perfect conditions for infections to set in. Combine this with pruning at this time, and that will be a recipe for disaster!

Pruning should take place during the mild portions of the year, or best, during dormancy.

From here, you will need to treat with a fungicide. Care will also require that you only water when the soil is completely dry down to about 3 or 4 inches.

Here are some articles that will help:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm

https://www.gardeningknowhow.com/ornamental/shrubs/ninebark/growing-ninebark-shrubs.htm

These plants are susceptible to powdery mildew. Try a light trim for now to remove dead stems and branches, and feed your plant. In late fall, you can hard-prune it down to a foot tall. Here's some info: https://www.gardeningknowhow.com/ornamental/shrubs/ninebark/growing-ninebark-shrubs.htm

They are pruned into a tree form so when you cut yours back in late winter or early spring, it should send up several new shoots.

https://plants.ces.ncsu.edu/plants/physocarpus-opulifolius-summer-wine/

We are based out of the US, so I am not as familiar with your weather patterns, as I am ours. From what I DO know- There is always a lot of rain.

With wet weather, there is a need to choose plants that will adapt to that. The other issue is that they will require a cold period throughout the year. These shrubs are only suitable for our USDA zones 2-7. The coldest your country gets, in any area, is equivalent to our zone 8. This is just a little too warm for this shrub, year round. (Rather, it does not get cold enough for this shrub). Much of your country is zone 9, though. This is too far out of the range for this shrubs to be comfortable.

All of these things, together, will make it very difficult to keep this shrub alive for long.

I would choose something suited to your area.

Here is more information on the Physocarpus:

https://www.gardeningknowhow.com/ornamental/shrubs/ninebark/growing-ninebark-shrubs.htm

Here is an article that will suggest plants that will do well in your area:

https://www.gardeningknowhow.com/ornamental/trees/tgen/wet-soil-trees.htm

https://www.gardeningknowhow.com/special/shade/shade-plants-for-wet-sites.htm

https://www.gardeningknowhow.com/edible/fruits/fegen/fruit-trees-in-wet-conditions.htm

https://www.gardeningknowhow.com/ornamental/water-plants/wgen/water-tolerant-plants.htm

Unfortunately, your photo did not come through. I suspect one of two possiblities. It is, either, a spider mite infestation, or tentworms! Here are some articles that will help:

https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-control.htm

https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-treatment.htm

https://www.gardeningknowhow.com/plant-problems/pests/insects/tent-worms-control.htm

https://www.gardeningknowhow.com/ornamental/shrubs/ninebark/growing-ninebark-shrubs.htm

Typically, this is done in very early spring, during dormancy, but right before growth starts for the year. You can choose to do so, right as it enters dormancy for the year, though. They can survive much colder temperatures than it will go down to in your area, so I wouldn't worry about the cold, too much.

Here are a couple of articles that will help:

https://www.gardeningknowhow.com/ornamental/shrubs/ninebark