Both spirodiclofen and etoxazole are long-lasting miticides, which have a good effect on eggs and young mites, but have little effect on adult mites. The efficacy period can reach more than 30 days, but spirodiclofen has some resistance to spider mites in some areas where it is used all year round, while etoxazole has a more stable control effect under low temperature conditions. The combination of these two agents with avermectin or adjuvants has a good synergistic effect, and the drug properties are better when used in the early stage of mite damage. Both can be used for crops such as apples, citrus, flowers, cotton and vegetables.
1. Characteristics and differences
(1) Ethioxazole
It mainly inhibits the embryo formation of mite eggs and the molting process from young mites to adult mites. It is effective for eggs and young mites, but not for adult mites. However, it has a good sterilizing effect on female adult mites. Therefore, the best time to use etoxazole for prevention and control is the early stage of mite damage. It has strong rain resistance and the drug effect can last for about 50 days.
(2) Spirodiclofen
① The active ingredient of spirodiclofen is mainly tetracycline, and its mechanism of action is to inhibit fat synthesis in harmful mites. It has no cross-resistance with existing miticides and is often used to control harmful mites that are resistant to existing miticides.
② It has a wide spectrum of miticides and strong adaptability: It has a good effect on red spider mites, rust mites, yellow spider mites, cinnabar spider mites, tea yellow mites and two-spotted spider mites. It can also be used to control mite damage on fruit trees such as grapes and citrus, and Solanaceae crops such as peppers, eggplants and tomatoes. In addition, mites have a good control effect on pests such as elm scale, pear psyllid and leafhoppers.
③ Killing eggs, larvae and worms: Spirodiclofen has a particularly good effect on killing eggs, and it also has a good contact killing effect on young mites. Although mites cannot kill female adult mites quickly, they have a good sterilization effect on female adult mites. Once female adult mites are exposed to the drug, about 96% of the eggs they lay cannot hatch and will die in the late embryonic stage.
④ Long duration of efficacy: Spirodiclofen has a long duration of efficacy and can control the damage of citrus panonychus mites for about 40-50 days. After spirodiclofen is applied to crop leaves, it can withstand rain erosion. Moderate rain will not affect the normal performance of the drug efficacy 2 hours after spraying.
⑤ Low toxicity, low residue and good safety: It is safe for crops under different temperature conditions, safe and low toxic to humans, animals and crops, and is more suitable for pollution-free production.
⑥ No mutual resistance: It can be directly mixed with most pesticides (except strong alkaline pesticides and copper preparations). Mixing with other acaricides with different mechanisms of action can not only improve the rapid effect of spirodiclofen, but also help control the resistance of mites.
(3) Summary
Spirodiclofen and etoxazole are both acaricides with a long lasting effect. They have good effects on eggs and nymphs, but have no effect on adult mites. Both have a lasting effect of more than one month, but spider mites in some areas where spirodiclofen is often used will develop resistance. Ethoxazole is a long-acting acaricide that has become popular in recent years. Ethoxazole has a stable effect in low temperature environments. These two acaricides can be combined with avermectin and adjuvants to enhance the efficacy of the drugs, and the effect is better when used in the early stage of mite infestation.
2. Dosage difference
(1) Ethoxazole: 11% etoxazole suspension is diluted 5000-7500 times with water for spraying. In the early stage of mites, etoxazole can be diluted 3500 times with water and sprayed. It has a good control effect on the egg stage, larval stage and nymph stage of mites, and the drug effect can last for about 50 days. The effect of etoxazole combined with avermectin will be better. In the middle and late stages of cotton and the cotton spider mite stage, etoxazole or spirodiclofen can be used, and avermectin can be used for control during the period.
(2) Spirodiclofen: Spirodiclofen is best applied only once during the citrus growing season. It should be used in rotation with other miticides with different miticide mechanisms to more effectively control resistant mites and reduce the risk of spider mites developing resistance to mites.
①Spirodicarb spring medication plan 1: When the damage of yellow spiders and red spiders reaches the control index (i.e. the number of eggs per leaf reaches 10 or the number of nymphs per leaf reaches 3-4), you can use 4000-5000 times of 34% spirodicarb suspension (each bottle of 100 ml is diluted with 800-1000 kilograms of water) for uniform spraying, which can basically control yellow spiders and red spiders for about 50 days. After that, if the number of yellow spiders and red spiders increases again, you can use a quick-acting acaricide (such as propargite, pyridaben and avermectin, etc.) once.
②Spiroclofen spring medication plan 2: When yellow spiders and red spiders occur early and have reached the control index, first use 1-2 times of fast-acting miticides (such as propargite, pyridaben and avermectin, etc.), and around early May, use 34% spiroclofen suspension 4000-5000 times liquid (each bottle of 100 ml is diluted with 800-1000 kilograms of water) to spray once, which can basically control yellow spiders and red spiders for about 50 days.
③Spiroclofen autumn medication plan: In September and October, when the number of yellow spiders and red spiders increases to the control index, 34% spiroclofen suspension 4000-5000 times liquid can be used for spraying again or mixed with other agents according to the mite situation, which can control until the citrus harvest until the winter garden is cleared.
3. Difference in effects
(1) Ethioxan: Mainly used to control red spider mites on apples and citrus. It also has very good control effects on spider mites, Tetranychus edulis, Panonychus mites, Tetranychus urticae and Tetranychus cinnabarinus on crops such as cotton, flowers and vegetables.
(2) Spirodiclofen: It has very good effects on yellow spider mites, tea yellow mites, red spider mites, rust mites, Tetranychus cinnabarinus and Tetranychus urticae. It is often used to control mites on fruit trees such as grapes and citrus, as well as Solanaceae crops such as peppers, eggplants and tomatoes. In addition, Spirodiclofen also has a good control effect on pests such as pear psylla, elm scale and leafhoppers.
