8 月 . 12, 2024 17:29 返回列表

防虫网

透明网是将一些食草无脊椎动物从脆弱植物中隔离的有效方法。它通常在没有支撑箍的情况下使用。

为什么要使用防虫网？

防虫网的主要目的是防止昆虫，例如菜粉蝶和跳蚤甲虫农作物。建立物理屏障是一种有效的方法，可以替代使用杀虫剂。

网眼看起来有点像网状窗帘，但由透明聚乙烯制成。网眼尺寸明显比园艺羊毛这意味着它提供的额外热量很少。但是，它确实能提供良好的防风、防雨和防冰雹性能。

优点

防虫

作为物理屏障，防虫网可以防止食草昆虫，通常不会显著升高温度（取决于网眼大小），但可以很好地防风防冰雹。它们还可以拦截大雨，减少大雨滴对土壤结构、苗床和幼苗造成的损害。还可以减少可能污染叶类作物的土壤飞溅。

Many problems including root feeding insects such as 胡萝卜蝇和甘蓝根蝇 are better managed by insect proof mesh than pesticides and the extra shelter leads to better plants and heavier crops.

Stretching mesh, even by placing over hoops, can widen the gaps and reduce efficacy. Check manufacturer’s instructions. The edges of the mesh are best buried under at least 5cms of soil.

植物在网状覆盖物下生长时不应拥挤，覆盖时应留有松弛空间以允许植物生长。

虽然 horticultural fleece can exclude invertebrates very effectively, it is much less durable and can be easily damaged when removed for weed control. Fleece can also raise temperatures and humidity to levels that might be undesirable.

轮作 should be practised, as some invertebrates can get through the mesh and might persist until the following year, ready to multiply when the same crop is planted and the mesh replaced.

防虫网

缺点

热量捕获有限

羊毛 should be used where crops need to be provided with extra warmth or frost protection.

助长疾病和蛞蝓

Raised humidity levels and subsequent soft, lush growth produced when growing under insect proof mesh may encourage diseases such as 灰霉病和霜霉病。蛞蝓和蜗牛网状物下方的较高湿度会促进其生长。

限制接触杂草

不幸的是，通常每两到三周就需要挖出植物，锄草，并疏苗。这会增加害虫入侵的风险，而一旦进入网内，害虫很可能会大量繁殖。

通过网眼产卵

如果网片接触到作物叶子，昆虫有时会通过网片产卵。确保网片不接触植物可降低发生这种情况的可能性。

授粉问题

昆虫授粉作物例如草莓和西葫芦开花期间不适合在防虫网下生长。

渔网和野生动物

野生动物可能会因花园网架设不当和管理不当而受到威胁。非常细的网眼，如防虫网或园艺羊毛是比较安全的选择之一，但必须将网的边缘埋入土壤下或固定在半埋入土壤的地面木板上，以固定网的边缘。尤其是鸟类可能会被松散的网缠住，这可能会导致它们死亡或受伤。

可持续发展

Insect proof mesh may last five to ten years but unfortunately cannot be easily recycled. However, local recycling facilities should be checked. Insect netting made from biodegradable plant starch is now available from 安德马特，为园丁们提供了环保的选择。

产品选择

Insect-proof mesh is offered in pre-cut sizes, a variety of widths and any length can be ordered ‘off the roll’. The larger the sheet and the closer it is to manufactured sizes the less it costs per square metre.

出售的防虫网也有各种不同的网眼尺寸。网眼越小，阻挡的昆虫越少，但成本越高，而且温度（网眼越细的防虫材料可能会导致覆盖的作物显著变暖）和湿度也可能会升高。另一方面，较细的防虫网往往更轻，使用起来也更方便，无需支撑环。

标准网格： 1.3-1.4mm。适用于以下昆虫甘蓝根蝇，洋葱蝇，豆种蝇和 carrot fly, as well as moth and butterfly pests. Birds and mammals can also be excluded. Although theoretically capable of penetrating mesh, mammals and larger birds seldom do, so there is rarely any need to add further protection such as bird netting. However, this size is unreliable in excluding small insects such as 蚜虫，跳蚤甲虫，葱叶潜叶虫和似乎是飞蛾。

细网格： 0.8mm. Good for very small insects such as flea beetles, cabbage whitefly, moth and butterflies, leaf miners (including allium leaf miner), 蚜虫，蚜虫、菜粉虱、洋葱蝇、豆籽蝇、胡萝卜蝇等。鸟类和哺乳动物也不包括在内。

超细网眼： 0.3-0.6mm。这种尺寸可以很好地防止蓟马、跳甲和其他非常小的无脊椎动物。鸟类和哺乳动物害虫也不包括在内。

蝴蝶网： 网眼尺寸为 4-7 毫米的细网可以有效防止白蝴蝶只要树叶不接触网，当然还有鸟类和哺乳动物。