Managing Potato Diseases and Underground Pest Control
February 2020
Yunnan, with a warm and humid climate, is suitable for potato cultivation. On February 29th, local Drone customer farming carried out late blight control on a local 40Acre potato field while controlling underground pests.
Parameter analysis: The shape of the operation plot is relatively regular, and the operation is carried out in the AB point mode. The flight speed is set to 6.5 meters. In the later stages of growth, the leaves of the potato are dense. Use this higher acre dose of 12 liters to improve coverage.
Operation Parameters
| Operation Mode | Intelligent automatic mode | Flight Speed | 6.5 m/s |
| Flight Altitude | 1.5 m | Spraying Width | 5 m |
| Weather | Sunny8-25℃ | Wind | Level 1-2 |
| Mixture | 6L/Acre | Nozzle Type | Fan shape XR11001VS |
Medication Information
40% dimethomorph suspension agent 240ml/acre, 40% fluazinam suspension agent 180ml/acre, 48% chlorpyrifos EC 180ml/acre, organic water-soluble fertilizer 240ml/acre, red swift low volume spray special adjuvant 90ml/acre.
Dimethomorph is a specific oomycete fungicide with systemic therapeutic properties and can be used to control downy mildew and late blight. Fluazinam is a broad-spectrum and efficient protective fungicide. Very effective against Alternaria, Phytophthora, Plasmopara, Sclerotinia, and Sclerotinia.
Chlorpyrifos is a broad-spectrum organophosphorus insecticide with stomach and contact effects and was used in this operation to control underground pests. The special adjuvant for the red swift low-volume spray is a special adjuvant for flight control, which can improve the effect of flight control.
Introduction to Pests and Diseases
Potato late blight is a worldwide disease with a high probability of occurrence on potatoes.
Caused by Phytophthora infestans, it is a devastating oomycete disease that causes leaf death and tuber rot in potatoes.
The infected leaves first develop water-soaked green-brown spots on the leaf tips or leaf margins, with a light green halo around the lesions. When the humidity is high, the lesions rapidly expand, turn brown, and produce a circle of white mold; when dry, the lesions turn brown Dry, brittle, and easy to crack, with no white mold, and slow expansion.
Stems or petioles are infected with brown streaks. The severely diseased leaves droop and curl, and eventually, the whole plant is black and rotted, and the whole field is scorched and rotten.
Tubers infected with primary brown or purple-brown large lesions, slightly sunken, and the subcutaneous potato flesh of the diseased part is also brown, and slowly expands or rots around. The disease is more severe in rainy years when the air is humid or warm and foggy.
Common underground pests that damage potatoes include needle worms, cutworms, and grubs.
The golden needle insect mainly bores the buds, roots, and underground stems of potatoes, causing the seedlings to gradually wilt or die. Drilling into the tuber creates tunnels and reduces quality.
Cutworm is a lepidopteran larva, which mainly harms potato seedlings. It bites the seedlings close to the ground, causing the whole seedling to die. The young larvae also bite the tender leaves, causing the leaves to have nicks and holes.
The grub, also called the ground silkworm, is the larva of the beetle. It mainly damages underground tender roots and tubers, causing above-ground stems and leaves to die due to insufficient nutrition and water supply.
After the tubers are bored, they cause loss of quality or cause rot. Adult insects can also fly onto plants to feed on leaves.
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