When holes appear in the leaves of our garden or orchard it may be due to the presence of slugs and snails but also to other causes, we explain why they can appear and how to avoid them.
How we could tell if the holes in her lettuces are caused by snails or caterpillars.
Taking advantage this question, we will go over all the possible causes of holes in the leaves of our crops. Indeed, the most common causes are caterpillars and slugs, but not the only ones. To identify the causes we will look at the signs:
Holes caused by caterpillars: We have to look for caterpillars, they usually have nocturnal habits, so sometimes they are difficult to locate. If they do not, their droppings in the form of small black balls will give away their presence. To control them, manually eliminate the caterpillars and the egg-laying that are located on the back of the leaves. If the infestation is serious, use an insecticide. In ECO cultivation, Bacillus thurigensis, neem oil (can be combined) or natural pyrethrins (in this order of use, pyrethrins only in serious cases, as they do not respect the auxiliary fauna). Outside Echo, any generic insecticide for domestic use and authorized for the crop in question can be used, respecting the safety deadlines (Tau-fluvalinate, chlorpyrifos).
Slugs-holes caused by snails or slugs: Like caterpillars, they also tend to “work” at night taking advantage of the cooler hours. Normally they leave a bright trail that reflects light when they pass through the leaves, it is the unmistakable sign of the passage of these animals. In Eco we can use a ferric phosphate based bait, which is much more effective than barriers or beer traps. Outside Eco any conventional helicide based on metaldehyde, although Eco is just as effective (although a little more expensive).
As we have said before, other causes can also generate holes in the leaves of the crops. For example, they can be caused by fungi (screening). Some fungi can produce a circular emptying in the leaves that can lead to confusion, this is common in stone fruit trees. They are normally rounded to a few millimetres and have changes in colour as the fungus advances. This type of fungus can be stopped with a copper-based contact fungicide.
Damage Hail A hailstorm can also cause holes to appear. In the case of having this incidence, we must carry out a treatment, as soon as the conditions allow us, with a copper-based fungicide. It will help us to heal the wounds produced and to prevent the attack of fungi through the entry routes of the breaks.