Severe poisoning shows itself when the nervous system is overwhelmed and the person also struggles to breathe. The combination of pinpoint pupils, muscle twitching, and trouble breathing is a clear signal of high-level pesticide exposure affecting both the muscarinic and nicotinic parts of the nervous system, plus the respiratory system. Pinpoint pupils come from parasympathetic overstimulation, muscle twitching reflects skeletal muscle stimulation, and difficulty breathing indicates bronchoconstriction and possible respiratory weakness. This set of signs means a life-threatening situation requiring immediate medical help. In contrast, fatigue, headache, and dizziness can occur with many situations and don’t alone indicate severe poisoning. If safe to do so, move the person to fresh air, remove contaminated clothing, and seek emergency assistance right away.

Drift reduction additives are designed to keep spray on target by making droplets larger, which lowers the chance they will be carried away by air currents. Larger droplets have more mass and tend to settle out of the air rather than drifting off-target. So the best description is that they increase droplet size and reduce drift. The idea behind drift control isn’t primarily about sticking to surfaces (that’s a retention/dropping effect) and making droplets smaller would actually increase drift, not reduce it.

Noninfectious diseases come from factors other than living pathogens. They arise when environmental conditions, genetics, nutrition, or chemical exposures affect the body's systems. For example, exposure to pesticides or other toxins, heat illness, or nutritional deficiencies can cause disease without involving an infectious agent. These conditions do not spread between people. Fungi, bacteria, and viruses are infectious agents that cause diseases by invading the body and often spreading from one person to another or through other transmission routes. That’s why they’re not considered noninfectious causes. So, the factor most associated with noninfectious disease in this context is environmental conditions, which can include chemical exposures and other environmental stresses that impact health without involving pathogens.

Adhesion to the treated surface is improved by film-forming modifiers known as stickers. Stickers create a thin, tacky film on the surface that helps the pesticide residue stick rather than run off with rain, irrigation, or wind. This keeps more of the product on the target long enough to work. Surfactants, which reduce surface tension to improve wetting and spreading, help the spray cover the surface better but don’t specifically enhance how well the residue clings to the surface over time. Penetrants aid the product’s movement into plant tissues rather than helping it stay on the surface. Drift reduction modifies how droplets behave in the air to minimize off-target movement, not adhesion to the surface.