![]() ![]() When larvae are infected with Heterorhabditis, they usually turn shades of red. These nematodes can be found much deeper in the soil than Steinernema and may be more appropriate for controlling scarab larvae. are typically hunters that can track grubs by following trails of exudates. Steinernema spp., for example, are typically an ambushing strain and dwell closer to the soil’s surface than Heterorhabditis spp. The species of nematode applied is also an important consideration. If nematodes are applied only once and hot dry conditions persist after application, they may have to be re-applied at some point. There is no data available, however, that suggests how long they will last. If nematodes are applied once or twice per year, there is evidence that their populations begin to sustain themselves after two to three years. Nematodes may be the only natural option available to you. There are species of Bacillus bacteria that cause milky disease in other scarab larvae, but they are not currently available. If the grubs in your lawn are identified as chafers or any species other than Japanese beetle larvae, Bp probably won’t be effective. ![]()
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