Pesticide Application Should Pay Attention To Details To Avoid Phytotoxicity - Pesticides, Crop

Spraying process, if not pay attention to details

, often will result in phytotoxicity of plants, affecting their normal growth and development, such as the impact of breathing light Cooperation With or transpiration.

Phytotoxicity Categories 1. Phytotoxicity after treatment of acute symptoms within a short period, such as leaf spots and, piercing, anxious, loss of green, deformities, leaves and so on; the fruit can produce fruit spot, rust fruit, or fruit drop; seeds germination rate is low or non-sprouting, root growth is not normal; plant growth retardation, dwarf, stem distortions. Phytotoxicity serious or even cause the entire plant dead.

2. Chronic phytotoxicity after spraying a longer time to onset of symptoms, such as plants appear malnutrition, inhibited growth, plant height, flower bud formation time is likely to delay or reduce seed set.

3. Residue left in the soil phytotoxicity Pesticide Or its decomposition products caused phytotoxicity, such as the slow decomposition Organic Pesticides and pesticide metal ions. Occurrence of factors

1. Pharmacy factor in oil, emulsion is easier to produce phytotoxicity, WP second, granules safer. In addition, poor quality pesticide products may also cause phytotoxicity. In recent years, the development of pest resistance, pesticide concentrations continue to increase, the number is increasing, this is the phytotoxicity produced one of the important reasons.

2. Plants differ from the sensitivity of plants to pesticides vary widely. Plants generally germination, seedling stage, flowering stage of the pharmaceutical sensitive, prone to phytotoxicity. Furthermore, small plants can not easily occur stomatal phytotoxicity thick waxy leaves, the plant cell wall strong resistance.

3. Environmental factors of temperature will increase pesticide chemical activity and metabolism of plants, pharmaceutical plants more invasive tissue caused phytotoxicity. For example, the higher the temperature, Danliugeji more volatile sulfur in gas phase, although disease control is better, but the possibility of a large produce phytotoxicity. Humidity conducive to pharmaceutical dissolved phytotoxicity invasive plants occur, such as Bordeaux mixture in the foggy, rainy days, humidity and other cases applying the susceptible to phytotoxicity. In addition, with little organic matter or sandy soil prone strong phytotoxicity, followed by loam, clay safer.

Prevention 1. Rational use of drugs before the use of pesticides must fully understand the performance of pesticides, such as formulations, active ingredients, control theory. Consider the biological characteristics and growth, to avoid the sensitive pharmaceutical plants bud stage, flowering stage spraying. Detailed investigation pest species, the number and developmental stages, and timely medication.

2. Check the quality of pesticide spraying pesticides before they identify whether the failure, such as whether there is hierarchical EC pesticides, sedimentation, flocculation phenomenon knot. If the upper oil slick, lower precipitation, shake the bottle can be forced to stand for 1 hour pesticide evenly; if, or layered, metamorphic failure that pesticides can not be used. WP take a small amount of lightly sprinkle the water, a minute if the pesticide is also insoluble in water, indicating failure has changed.

3. Pesticide dilution to achieve reasonable levels of pesticides, can achieve the good effect, without causing phytotoxicity. Dilution of each pesticide usually has a range of options between the minimum and maximum dilution of the middle between the concentration of dilution is the preferred method.

4. To consider the sensitivity of plants to pharmaceutical control when spraying to avoid sensitive plant drugs.

5. Meteorological factors spraying to choose sunny windless weather, to avoid spraying the high temperature stage at noon. No special requirements, such as pesticides, the best application time is 8 am? 00-10? 00, at 4? 00-6? 00.

6. Spray application techniques must be uniform and thoughtful, to avoid excessive spraying of local leaves. Choose a suitable spraying equipment. Injection should be strictly dose calculation, it is best not to use liquid. Gensch granules to water after dilution.

7. Increase soil moisture during dry seasons, when water plants, irrigation increased soil moisture before spraying is an effective measure to prevent phytotoxicity produced.

by: gaga

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