The notes found that the weather has led to two-spotted spider mites appearing earlier.
Consultant John Atwood said: "Spider mites have increased in the hot weather, appearing earlier than normal. The problem was also bad last year. Plants under protection have been affected more, but there have been some cases outside as well."
The weather has also brought on powdery mildew earlier, with the disease hitting crops including clematis, hydrangea, lonicera, photinia, pulmonaria, potentilla, rosa, spiraea and verbena.
Aphids are continuing to dominate the pest scene with outbreaks in a number of plants, according to the consultancy. Plants affected include acer, cistus, chaenomeles, digitalis, euphorbia, fuchsia, helleborus, ilex, lavateria and lonicera.
However, aphid problems are in line with previous years. "Aphids have not been bad and certainly no worse than normal," said ADAS consultant John Buxton.
"The cold winter has actually made them a bit later than normal. I have seen other pests, such as spider mites, on the usual plants. Again, it doesn't seem much worse than normal which is a surprise considering the warmer spring."