Raspberries
If you find your berries are still ripe but they have with dried patches at the stalk, you probably have grubs or beetle larvae inside the raspberries. Think about growing late fruiting raspberries e.g. Joan Squire because beetle attacks happen less during late August onwards.
If you do have beetle larvae, apply either Bio Liquid Derris Plus or Vitax Derris Dust and follow the manufacturer’s instructions closely.

Grubs are caused by poor pollination and low temperature damage / lack of moisture.
If you see a brownish-/grey fluff on the ripening fruit this would indicate a grey mould infection. If this is the case, ensure you have good air circulation and quickly remove and dispose of the affected fruit before the mould spreads.
To protect ripening fruit from birds use netting.

Grapes
If you see a white/grey powder coating the leaves of indoor or outdoor grapes you have fungus.
If your grapes are indoor, open windows and doors for ventilation. Fungus favours humid conditions so improving air movement around leaves is a good tip.
Ensure you pinch out shoot tips beyond the growing grapes. Shorten re-growth to one leaf pinching.
Make sure you thin unwanted shoots tying in new growth to achieve even spacing and to encourage good air circulation.
If you have outdoor grapes mulch the base when your soil is moist. With outdoor vines you will get less mildew but you have to watch for dry soil.
Dust foliage with Sulphur, you will need to repeat maybe up to 4 times throughout the season to keep the disease at bay.

Weed control
Other than being unsightly, weeds will rigorously compete for nutrients, water and the light and they harbour pests and diseases.
You really should not allow weeds to establish themselves at all. Make sure you hoe annual weeds at early seedling stage during a dry day to ensure the seedlings will wither and die.