General outlook A few 100+ F daily maximum temperatures and warm nights will give thrips development a little boost over the next week. A gradual return to low-to-mid 90's highs is expected from now until second week of June. The current mini heat wave won't be enough to cause any mortality in thrips. Degree day accumulation for thrips this season is about two days last year and roughly 5 days ahead of the 30-year normal.
Population projections Generation 3 post winter adults peaked in the last few days. Generation 4 adults are currently projected to peak around June 18th. These two generations are the first that are likely to have any appreciable level of TSWV in them, so any plans to apply insecticide specifically to control thrips and suppress TSWV should be scheduled sometime in soon. If you are not seeing any signs of TSWV in your area you may want to consider delaying treatment and re-assessing the situation for generation 5.
We still have no reports of SW-5 resistance breaking strains in the mid San Joaquin Valley so crops carrying the SW-5 resistance to TSWV should see little effect of the virus again this season. Please report any unusual virus-like symptoms to your local UCCE adviser. In addition to TSWV there are a number of other viruses that might show up in tomato. Most of these will have minimal effects on yield in processing crops, but we are always on the look out for reports of viruses to help get a complete picture of what's happening across the region.