Calculation method of pesticide mixture

For the mixed use of pesticides, the dosage of each agent must be calculated, and the pairing can be accurately weighed in order to achieve cost-effective application.

1. Mixing pesticides with different acting objects can be calculated separately according to the following formula. The amount of pesticide required = the amount of mixed liquid ÷ the dilution factor of this pesticide. For example, in the summer, the early defoliation of apples and the small heartworms of peaches should be prepared. It is necessary to prepare 800 times of thiophanate-methyl and 100 times of mixture of 50-fold parathion 1500 times. What are the above two pesticides and water? Methyl thiophanate dosage = 100 kg ÷ 800 times = 0.125 kg (125 g), parathion dosage = 100 kg ÷ 1500 times liquid = 0.067 kg (67 g), water consumption = 100 kg (in pesticide dilution, When the multiple is more than 100 times, the external ratio method can be used without deducting 1 part of the drug itself; when the dilution factor is less than 100 times, the internal ratio method is used, and a portion of the drug itself must be deducted to avoid concentration. error). Different pesticides are used in different combinations. The active ingredients of various pesticides work alone. As in the above example, thiophanate-methyl only controls early defoliation, and parathion only controls peach worms. . The amount of each pesticide used in the mixing is the same as that used when used alone.

2. The calculation method of pesticide mixing with the same target. For example, the combination of pyrethroid pesticides with monocrotophos or methyl parathion can delay the emergence and development of resistance to pyrethroid pesticides in cotton aphid. Now it is necessary to match 2.5% enemy kill 5000 times and 50% monocrotophos 2000 times liquid 100 kg to control cotton aphid. How much do you need the above two kinds of liquid medicine? Single with 5000 times 2.5% enemy killing amount is 100 kg ÷ 5000 times = 0.02 kg (20 g), single with 2000 times 50% monocrotophos dosage is 100 kg ÷ 2000 times = 0.05 kg (50 g), enemy The target of killing and monocrotophos is cotton aphid. If the dosage is still according to the single compound, the concentration of the liquid is doubled. Therefore, the amount of each of the above two pesticides should be divided by 2, that is, the enemy. Kill 10 grams, 25 grams of monocrotophos. If the three pesticides with the same control object are mixed, the doubling amount should be divided by 3.

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