I'd be concerned to0 because that was a big investment. Though I don't know what insect it is, it would take a many seasons of more serious afflictions to kill those big plants. They are far more likely to be killed by your overwatering than by loss of a little chlorophyll. . While waiting I think you can take some comfort that your plants leafing out well and the knowledge that one week or one season of pests will not kill them. They put out good leaves and those small holes, at this point, are a cosmetic problem.

Please google the product they want to use to see for yourself how toxic it might be to bees and groundwater. The landscaper's interest, understandably, is to keep you happy perhaps at a cost to the environment and protect their own investment of time and money. One might say it is their responsibility to know their products and use them correctly; as the homeowner you share the reponsibility for being informed. You need to understand what they will spray in your yard and how it might affect your small ecosystem. If they decide to use a chemical be sure they apply it at the correct time of day when insects are inactive. By the way, I'm not against "chemicals' per se, just ignorant, careless, incorrect and indiscriminate use of them. If they just assure you its "safe" and "we use it all the time" contact your county extension service to check it out yourself.

You are to be congratulated on being an observant gardener. HOwever, no matter how much money you spent on your plants they are still just plants and no guarantee will ensure they won't sometimes get nibbled by bugs, eaten by rabbits, browsed by deer or get spotted or buckshot from an insect that likes their taste. As a gardener of 40 years with many a nibbled and spotted plant I assure you there's no need to go in loaded for bear; waiting a little longer to get answers will do no harm to your beautiful shrubs.

Marie

It's NOT an insect and IS shothole. It's as common as mud with almost any cultivar of English laurel. And has both bacterial and fungal causal agents. Avoid any overhead watering (sprinklers that hit the foliage) and clean up and destroy any fallen leaves. It does tend to be more cosmetic than causing actual harm to the plants but you can certainly treat with a fungicide to reduce the occurrence. You want to look for something with chlorothalonil as the active ingredient (Daconil, Bravo).