<h1 class="pgc-h-arrow-right" > ↓ (at the bottom of the article, there is a video explanatory version, do not like to read the text, you can directly click to play at the bottom) ↓</h1>
<h1 class="pgc-h-arrow-right" > wheat sporangiae are coming! Hurry up and take a look at the wheat fields! </h1>
Wheat sporangia nematodes are very harmful to wheat, generally can reduce wheat yield by 20%-30%, and the yield of plots with serious diseases can be reduced by up to 70%, which has occurred in Henan in recent years.
1. Nematode pathogen: Wheat cystic nematode disease is caused by a nematode infestation. The pathogen is oat sporangiae, a genus of mitozoan phylum penodermal nematodes. The eggs are oblong, transparent on the outside, and the egg shell is tough; the first-instar larvae are first coiled in the egg shell, then break out of the egg shell, and then peel off into a second-instar larvae. It can survive in dry galls for about ten years.
2, harmful symptoms: wheat from seedlings to maturity can be spread, seedlings a month later, you can appear symptoms, after returning to green before obviously showing, the lower leaves from the tip of the leaf began to turn yellow, and then the entire color became light and brown, dry and dead. The growth of the seedling stage is weak, the tillers are significantly reduced, the affected plants are dwarfed, and the small grains of the ears are thin, similar to the symptoms of fertilizer deficiency. When the condition is severe, it dies in pieces. The root sees many nodular root knots, long whiskered roots on the root nodes, the root system is chaotic, twisted, clumped, the surface of the root can be seen in the needle size white cyst, later brown, the root node and the cyst are the main basis for identification.
3, the transmission route: wheat root node cystic nematode disease spreader is the cystic, mainly soil transmission, agricultural machinery cross-regional operation of combine harvesters, seeds, flowing water and strong winds can cause transmission.
<h1 class="pgc-h-arrow-right" >4, prevention method:</h1>
(1) Wheat sowing period: sowing per mu with 10% thiazolium phosphorus granules 2-4 kg or avermectin granules 5 kg: or with avermectin microcapsules according to the drug seed ratio 1:45 dose of seed mixing, the prevention effect is better.
(2) In the spring, the field blocks are watered with octyl thiophos or chlorpyrifos 500-1000 times liquid after irrigating the roots.
(3) Avermectin + rooting powder sprayed to the roots or irrigation roots.
(4) Timely application of fast-acting nitrogen can also significantly reduce symptoms.
(5) Foliar spraying of potassium dihydrogen phosphate + urea + brassicasin + avermectin.
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March 24,