How to test your lawn for grubs and what to do if you find them
- Brown patches in lawns can be caused by various factors, including grubs, but small populations of grubs are usually not problematic.
- To check for grubs, homeowners should dig up a 3- to 4-inch-deep section of lawn and look for white, brown-headed larvae.
- Fewer than 10 grubs per square foot is considered normal and does not require treatment.
- If grubs are present in larger numbers, treatments should be applied in late summer when they are most vulnerable.
- Natural treatments like beneficial nematodes are recommended over chemical options due to their safety for the environment.
Brown patches in lawns can arise from various causes, including drought, dog urine, fungal diseases, pests, or excessive fertilizer. Many homeowners often suspect grubs as the cause, but small populations are generally not harmful. Treatment should only be considered after confirming a true grub infestation.
To determine if grubs are present, homeowners can dig a 3- to 4-inch-deep section of lawn, measuring 12 inches square, from an area showing symptoms. Grubs, which are the larvae of beetles, will appear as whitish, brown-headed, C-shaped creatures. Fewer than 10 grubs per square foot is normal and does not indicate an infestation.
If grubs are found in numbers of 10 or more, treatment should be applied, particularly in late summer when they are most susceptible. Natural options include milky spore powder for Japanese beetle grubs and beneficial nematodes, which attack various grub types. It is important to water the soil before applying these treatments and to avoid chemical pesticides due to their potential harm to beneficial organisms and the environment.
如何检测草坪中的蛴螬及发现后该如何处理
草坪上的褐色斑块可能由多种原因引起，包括干旱、狗尿、真菌病、害虫或过量施肥。许多房主通常怀疑蛴螬是原因，但小数量的蛴螬通常无害。只有在确认真正的蛴螬侵扰后，才应考虑处理。
要确定是否存在蛴螬，房主可以从显示症状的区域挖出一个3到4英寸深、12英寸见方的草坪部分。蛴螬是甲虫的幼虫，呈白色、棕头、C形。每平方英尺少于10只蛴螬被视为正常，不表示有侵扰。
如果发现蛴螬数量达到10只或更多，应在夏末施用处理措施，因为此时它们最脆弱。天然选项包括用于日本甲虫蛴螬的乳酸孢子粉和攻击多种蛴螬的有益线虫。在施用这些处理前，重要的是要充分浇水，并避免使用化学农药，因为它们可能对有益生物和环境造成伤害。