The best time to spray rape depends on the pest that has affected the field.
The best time to spray rapeseed as an oilseed plant with high nutritional value and growing economic importance is a topic that without knowing the important pests of rapeseed, it will definitely lead to failure; Because according to the observation of about 26 types of pests in rapeseed fields of Iran, spraying at the wrong time will have no results other than crop loss, waste of time and human energy, and imposing the cost of poison.
The best time to spray canola is different depending on the pest that has affected the field, so we will discuss the introduction of important canola pests below;
* Vegetable coke was introduced in the previous topic. The next pest that may affect your rape field is the mandab beetle. Seeing plants with only veins left on their leaves indicates the existence of the mandab beetle in the larval stage or as a complete insect.
Identifying this cockroach when the insect is complete is not so difficult; It is brown-red in color with a dark transverse band in the wide anthers and in the wings. The complete insect of Mandab beetle can be seen in the size of 8 to 10 mm. But the larva is 10 to 12 mm long and has a black head, gray back and yellow underbelly, three pairs of legs on the chest and warts on the back of the body.
Mandab beetle is in the form of eggs in the soil in winter; But in the month of March, the larvae start feeding on the leaves of the plants that are available on the ground. Spring is the time when the larvae leave the soil and become pupae and spend the summer in diapause in the soil; But late summer is the time for this insect to wake up and mate.
Fighting the mandab rapeseed beetle
It is recommended to fight the mandab cockroach; In winter, the land should be plowed deeply to reduce their population; But the most effective way is to use a complete and perfect spray. Pesticides that were used to combat plant fleas in canola fields are also used to combat this decline.
The following poisons are recommended to fight the mandab cockroach;
Diazinon, fuzalen and chlorpyrifos respectively at the rate of 2-1.5 liters, 2-3 liters and 2-2.5 liters per hectare of rapeseed.
The best time to spray rapeseed affected by the Mandab beetle pest
The best time to spray the rapeseed affected by the Mandab beetle pest is when you see the first larvae or the first full insects. As mentioned in the above section, the larvae come out of the soil in the spring, if you spray in the early stages of the larvae, you will prevent future damage.
But the best time to spray canola will be completed when you can choose the best spraying method. As you know, with the increase in the price of the currency, the price of poisons has also increased, so the best spraying method should firstly help you to save up to 30% in the amount of poison consumed, and the waste of your poison should be minimized. Remember; Spraying that is not done with uniform spraying and at the right height will lead to an increase in the consumption of poison in some parts of the farm.
On the other hand, we grow canola that is economically profitable, so we don't want to use a lot of manpower for spraying in a pest-affected farm and have high manpower costs. According to these issues, among the types of spraying methods, the use of spraying drones is recommended. For a long time, drones have been used in mechanized agriculture in developed countries to take advantage of the other advantages of sprayer drones, some of which we have mentioned above, in addition to the high spraying speed.
Introduction of rape stem weevil pest
The next important pest that threatens your canola field is the canola stem weevil; A pest that presents itself with spawning holes from mid-December to mid-January. In winter and spring, the larvae start by feeding on the petiole and main vein, then they go to the main stem and crown and do their damage. If you touch the stem at this time, you will see; It becomes spongy and gets crushed. It is also worth mentioning; The damaged stem or pod ripens earlier, as a result the seeds fall, this damage to the crown creates the next problem; It paves the way for other pests such as rot-eating insects and finally, when the insect is complete, it feeds on the flowers. Canola stem weevil eggs are white, which you can see on the stem or pod. The larva is milky white without legs and has a darker head capsule; But the full insect, which is 3-4 mm long, has a long and thin curved proboscis and is grayish-white in color.
The best time to spray canola affected by weevils
Before thinking about the best time to spray canola infected with weevil, it is better to start with measures such as using resistant cultivars and increasing the larval period by increasing soil nitrogen with fertilizer.
* The best time to spray canola is when you see one weevil for every five plants with yellow traps containing water or on more than 20% of the canola plants in the field. Also, if you see spawning on more than 20% of the plants, it is the best time to spray.
* To spray canola during flowering, great care is needed; Because of the fact that insects feed on flowers, by observing the weevil before causing more damage to the flowers, it is better to use spraying like a sprayer drone, so that problems such as wind blowing, which is the result of not spraying evenly, do not reach lower poison limits.
Now, due to the use of UAVs in agriculture for fertilizing and spraying, sprayer rental services at reasonable prices are available to Iranian farmers so that they can plant large areas with minimal service costs. We need about 4 mills of rapeseed, oil and flour for our country every year
