How to control aphids on spinach? A full analysis of the latest control methods
Spinach is a common vegetable in daily life, with good taste and high nutritional value, deeply favored by consumers, and its planting area is also relatively wide. During the planting process, aphids are the pest with the highest incidence rate and the longest damage period on spinach, seriously affecting growers' income. Below, the editor has summarized for everyone the symptoms, patterns, and control methods of aphids on spinach, for your reference.
1. Damage symptoms
Aphids, also known as honey bugs, mainly parasitize the leaves of spinach, continuously sucking the leaf juice with their piercing mouthparts. The sucked areas lose water and wilt, ultimately causing the leaves to curl, and growth to slow or stagnate, resulting in poor spinach growth. During their outbreak period, large numbers of aphids gather on the leaves and can suck an entire leaf dry in a short time, causing the whole plant to wither and die. At the same time, they are also transmitters of various diseases, such as viral diseases, seriously affecting plant growth, affecting later yield, and even possibly causing total crop failure.
2. Occurrence patterns
Aphids reproduce extremely fast, generally producing over a dozen to twenty-something generations per year. Their reproduction speed changes according to temperature conditions, and they can occur year-round in both the north and the south. Generally, in North China, more than 10 generations occur each year, while in the Yangtze River Basin, 20-30 generations occur. They have a strong tendency toward yellow and an avoidance response to silver-gray. Adults and nymphs mainly gather on leaves and tender stems to absorb juice, and the honeydew they secrete can also cause leaf curling, growth stagnation, and can spread diseases.
3. Control methods
Aphid control should be approached from multiple aspects. First, biological control methods can be adopted to maintain ecological balance and make full use of the natural enemies of aphids for biological control. The natural enemies of aphids include the seven-spotted ladybird, the harlequin ladybird, hoverflies, and others. Then physical control can be carried out. Aphids are more sensitive to yellow, and this can be fully utilized during planting by hanging yellow cardboard smeared with pesticide between vegetable rows. The cardboard should be replaced regularly. This can reduce the use of pesticides, lower pesticide residues, improve quality, and achieve green, pollution-free food. Finally, chemical control can be adopted, using pesticides such as pirimicarb, dimethoate, and fenvalerate. However, attention should be paid to the concentration, and pesticides should be used alternately to avoid developing resistance.
The above is an introduction to how to control aphids on spinach. We hope it can help you. To learn more related knowledge, please stay tuned to us.