It is necessary to control rice leaf rollers in time.
Rice leaf roller is one of the main pests of rice in our province. It damages rice leaves with larvae, which can make rice leaves dry and white, especially at booting stage or heading stage, and will greatly reduce rice yield. The insect has seven generations in a year. The number of larvae in the second generation of early rice is the most, and the damage is the most serious. If the control is not timely, it will occur during the heading period, causing incalculable losses.
The prediction of occurrence period should be used to determine the suitable control period for rice leaf roller. According to the past situation, the investigation should be started 4 days after the peak of moth emergence, once every 2 weeks, pay close attention to the progress of larval occurrence, when the 1~2 instar larvae account for about 70% of the total, or every 100 families have about 15 buds, that is, the appropriate period for control. Because this time is the larval peak incubation period, master in the peak incubation period when the larvae are the weakest, but also larvae concentrated on the base of the heart leaf feeding, if the pesticide sprayed to the base of the heart leaf, that is, most of the larvae can be killed, the effect is the best. If the pesticide is applied late, the larvae are already trapped in the leaf tube, and the application effect is poor.
In order to get the best effect of this insect control, we must choose the corresponding pesticide to spray. In the larval incubation period, 200ml of 25% bisultap solution plus 50ml of 40% dimethoate EC or 100~ 125ml of 20% frog EC mixed with 60kg of water can be sprayed to kill the larvae. The control effect is better.
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Causes and Countermeasures of abnormal Leaf Color of Wheat seedlings
After sowing and emergence of wheat, all kinds of abnormal heterochromatic seedlings are often formed due to the influence of natural conditions and cultivation measures. In order to facilitate seedling and symptomatic management, they are introduced as follows. Causes of yellowing of wheat leaves in yellow leaf seedlings. First, the soil is dry. This kind of situation often occurs in the wheat field where the soil moisture is insufficient or the soil moisture is running away through ventilation. It is characterized by slow birth of tillers, gray-green leaves, short heart leaves, slow growth or stagnation (called by the masses as "shrinking seedlings"), yellow and dry leaves in the middle and lower parts, and few and thin roots. Key points of management
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Don't feed fresh wheat chaff to livestock.
As soon as the wheat is harvested, new chaff comes out. However, the newly husked wheat chaff cannot be fed directly to livestock (cattle, horses, donkeys, mules). Otherwise, livestock eat untreated new wheat chaff, mouth is easy to be broken by wheat awn and inflammation. If you want to feed livestock with new wheat bran, you can soak it in 0.3%~0.5% new lime water for 4 hours to make the new wheat bran alkalized and softened, and then feed it after washing it with clean water. In this way, livestock eat easy digestion, can increase calcium to make livestock physique strong; can also let the new wheat chaff stored in the natural strong state for 1 month, in the wheat awn
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