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Flower blight of bedding plants is one of the first symptoms of this disease . Later in the season , stem lesions turn gray and produce black spore-containing structures called pycnidia . Insecticidal soap is a less toxic option to consider , especially on herbs since there are few insecticides labeled for use on herbs . We note that precise orbit control ( using GPS ) is a critical ingredient to any successful SAR interferometry mission . Some common insect pests on apples are apple maggot , plum curculio , and codling moth .