How to Treat Aphids on Napa Cabbage? A Full Analysis of the Latest Control Methods
Napa cabbage is a vegetable we eat often. Earlier, news reports said that napa cabbage had excessive toxin levels, which caused sales of napa cabbage to plummet to rock bottom, and many people did not dare to buy napa cabbage during that period. The main reason was that field management during the growth period of napa cabbage was not handled well, and then large amounts of pesticides were used to prevent insects and disease. Aphids cause the greatest harm to napa cabbage and run through the entire growth period. So today what we want to understand is how to treat aphids on napa cabbage. Let's take a look together.
1. Seedling stage
Aphids also appear quite often during the seedling stage of napa cabbage. At this time, aphids mainly affect the survival rate and growth of napa cabbage, because napa cabbage is still relatively small and fragile during this period, and aphids mainly gnaw on small leaves and the heart of the napa cabbage, leaving only the small white stems, and they do not even spare the small stems. So at this stage, if we are growing on a small area, we can kill the aphids by hand, while for large-area planting, we can use yellow sticky boards to trap and kill them as well as chemical control.
2. Rosette stage
The rosette stage is also the time when napa cabbage grows most vigorously. During this period, the growing leaves of napa cabbage determine its weight, and the main pest at this time is still aphids, and the number that breaks out is even greater than at the seedling stage, so the harm to napa cabbage is also greater. If it is not controlled in time, it will trigger other diseases, so the impact on napa cabbage is not just the harm of aphids. In severe cases, it may even cause the whole napa cabbage to rot or wilt and die. We can reduce the occurrence of pests by clearing weeds in the field. At the same time, we can also enhance the resistance of napa cabbage by loosening the soil and applying fertilizer. We can also spread lime in the field to kill insects. Of course, we can also spray pesticides that are non-toxic to napa cabbage itself or use soap for control.
3. Heading stage
The heading stage of napa cabbage is also the most important period of its growth. It determines the quality and yield of napa cabbage, and this period is also when aphids appear the most. At this time, aphids have an enormous impact on the quality of napa cabbage. At the same time, at this stage we can no longer use chemical agents for control, because it will have a great impact on the quality of napa cabbage. Even low-toxicity or non-toxic agents will not do. So how should we remove the insects? First, we need to promptly clear away the withered leaves of napa cabbage in the field and not let them rot, otherwise they will attract other pests. Second, we can use trapping methods in time, and then we can use mesh fabric to control pests. If there are really too many aphids, we can appropriately use fumigation for control or use a small amount of phosphorus-free laundry detergent for control.
The above are some simple methods that the editor wants to share with you today about how to control aphids on napa cabbage. Here, there is one more thing to remind everyone: whether at the seedling stage, rosette stage or heading stage, no pesticides used to control pests and diseases can be sprayed within half a month before harvest, because otherwise the napa cabbage will still carry some toxins, and it will not be good if it causes poisoning. If everyone still wants to learn more agricultural knowledge, remember to follow us.