Spinetoram is a relatively new and highly effective insecticide that has gained significant attention in the agricultural and pest - control industries. As a supplier of Spinetoram, I often encounter the question: "Is Spinetoram a contact or stomach insecticide?" To answer this question comprehensively, we need to understand the mode of action of Spinetoram, its chemical properties, and how it interacts with target insects.
Chemical Composition and General Properties of Spinetoram
Spinetoram is a member of the spinosyn class of insecticides. It is a semi - synthetic derivative of spinosad, which is a naturally occurring mixture of two active ingredients, spinosyn A and spinosyn D, produced by the soil bacterium Saccharopolyspora spinosa. Spinetoram is composed of two main components, 3'-ethoxy - 5,6 - dihydrospinosyn J and 3'-ethoxyspinosyn L, which are structurally similar to the spinosyns in spinosad but have enhanced efficacy and broader spectrum of activity.
The chemical structure of Spinetoram gives it certain physical and chemical properties that are crucial for its mode of action. It is relatively non - volatile, with a low vapor pressure, which means it is less likely to evaporate quickly from the treated surface. This property allows it to remain on the plant surface or in the environment for an extended period, increasing the chances of contact with target insects.
Contact Insecticide Properties of Spinetoram
A contact insecticide is one that kills insects upon direct contact with the insect's body. Spinetoram has notable contact activity. When an insect comes into direct contact with a surface treated with Spinetoram, the insecticide can penetrate the insect's cuticle. The cuticle is the outer protective layer of the insect, and Spinetoram is able to dissolve in the wax layer of the cuticle and enter the insect's body.
Once inside the insect, Spinetoram acts on the insect's nervous system. It binds to the nicotinic acetylcholine receptors (nAChRs) and the gamma - aminobutyric acid (GABA) receptors in the insect's nerve cells. By binding to these receptors, Spinetoram disrupts the normal transmission of nerve impulses. This leads to over - excitation of the nervous system, causing symptoms such as tremors, paralysis, and eventually death of the insect.
In field applications, the contact activity of Spinetoram is particularly useful for controlling insects that are mobile on the plant surface. For example, aphids, which are small, soft - bodied insects that feed on plant sap by piercing the plant tissue, can be effectively controlled when they crawl over a Spinetoram - treated surface. The insecticide can quickly penetrate their thin cuticles and cause rapid knockdown and mortality.
Stomach Insecticide Properties of Spinetoram
A stomach insecticide is ingested by the insect and exerts its toxic effects from within the insect's digestive system. Spinetoram also functions as a potent stomach insecticide. When insects feed on plant parts that have been treated with Spinetoram, the insecticide is ingested along with the plant material.
Once in the insect's gut, Spinetoram is absorbed into the bloodstream through the gut wall. Similar to its action when it enters the body through contact, it then targets the nAChRs and GABA receptors in the nervous system. Insects that chew on plant leaves, such as caterpillars, are highly susceptible to the stomach - acting properties of Spinetoram. When caterpillars consume leaves coated with Spinetoram, the insecticide is ingested, and it starts to disrupt the normal functioning of their nervous system, leading to cessation of feeding and eventual death.
Comparison with Other Insecticides
To better understand the unique characteristics of Spinetoram as both a contact and stomach insecticide, it is useful to compare it with other well - known insecticides.
For example, Insecticide CAS 6S - Methoprene 95%TC 5733 - 16 - 6 is an insect growth regulator. It works by interfering with the normal growth and development of insects, mainly targeting the juvenile hormone system. Unlike Spinetoram, it does not act directly on the nervous system and its mode of action is more focused on preventing the normal metamorphosis of insects rather than causing immediate mortality through nerve - related effects.
Insecticide Metarhizium Anisopliae 10 Billion Spores Per Gram WP is a biological insecticide. It infects insects by adhering to the insect's cuticle, germinating, and then penetrating the cuticle to grow inside the insect's body. It kills the insect by producing toxins and using the insect's body as a nutrient source. In contrast, Spinetoram is a chemical insecticide with a more direct and rapid - acting mode of action on the nervous system.
Chlorpyrifos 2921 - 88 - 2 is an organophosphate insecticide. It also acts on the nervous system by inhibiting the enzyme acetylcholinesterase, which is responsible for breaking down the neurotransmitter acetylcholine. Spinetoram, on the other hand, acts on different receptors (nAChRs and GABA receptors) in the nervous system, which gives it a different spectrum of activity and potential for resistance management.
Advantages of Spinetoram's Dual Mode of Action
The fact that Spinetoram acts both as a contact and a stomach insecticide provides several advantages in pest control.
Firstly, it offers a broader spectrum of control. Insect pests have different feeding and movement habits. Some insects are more likely to come into direct contact with the treated surface, while others feed on the plant material. Spinetoram can target both types of insects effectively, making it suitable for controlling a wide range of pests in different crops.
Secondly, it increases the likelihood of pest control success. In a real - world agricultural setting, it can be difficult to ensure that all insects are either directly contacted or ingesting the insecticide. With Spinetoram's dual mode of action, even if an insect only partially comes into contact with the treated area or takes a small amount of the treated plant material, it can still be affected by the insecticide.
Finally, it helps in resistance management. Insects can develop resistance to insecticides over time. By having two different ways of entering the insect's body and acting on the nervous system, Spinetoram makes it more difficult for insects to develop resistance compared to insecticides with a single mode of action.
Applications in Agriculture
Spinetoram is widely used in agriculture to control a variety of pests in different crops. In fruit orchards, it can be used to control pests such as codling moths, which are major pests of apples and pears. The contact activity of Spinetoram can kill the adult moths when they land on the treated tree surfaces, and the stomach activity can kill the larvae when they feed on the fruit.
In vegetable crops, it is effective against pests like thrips, which are tiny insects that can cause significant damage to leaves and flowers. Thrips are highly mobile and can be controlled by the contact activity of Spinetoram when they move over the treated plant parts, as well as by the stomach activity when they feed on the treated tissue.
Conclusion
In conclusion, Spinetoram is both a contact and a stomach insecticide. Its unique chemical structure allows it to penetrate the insect's cuticle upon contact and also be ingested by insects during feeding. By targeting the nAChRs and GABA receptors in the insect's nervous system, it causes rapid and effective control of a wide range of insect pests.
As a supplier of Spinetoram, I am confident in the product's performance and its potential to meet the pest - control needs of farmers and pest - control professionals. If you are interested in learning more about Spinetoram or are looking to purchase this high - quality insecticide for your agricultural or pest - control operations, please feel free to contact us for further details and to start a procurement negotiation.
References
- Thompson, G. D., & Hutchins, S. H. (2006). Spinetoram: a new spinosyn for insect control. Pest Management Science, 62(10), 958 - 966.
- Sparks, T. C., Crouse, G. D., Watson, G. B., & Watson, G. B. (2001). The spinosyns: Chemistry, biochemistry, mode of action, and resistance. Pest Management Science, 57(9), 896 - 905.
- Williams, T. W., Pennington, J. E., & Kuhar, T. P. (2010). Evaluation of spinetoram for control of thrips (Thysanoptera: Thripidae) in fresh - market tomatoes. Journal of Economic Entomology, 103(3), 911 - 916.
