Stem Fly (Chakrabhunga) Insect Management of Soy Crop (Dec 04, 2017)

Soybean crops are cultivated in large amount in Vidarbha. However, farmer conducted surveys from time to time on soybean crops, Stem fly (chakrabhunga) major pest of soybean in all the soybean growing areas, therefore, farmers should regularly monitor their soy bean crops and take measures for controlling these insects as soon as they reach the level of economic loss. 

Symptoms: 

The adult flies are shining black and about 2 mm long. The damaging stage is maggot which is white in colour and remains inside the stem.

Female adults lay eggs inside the cotyledon or leaves. After hatching from eggs, the maggots mine through the leaf and reach the petiole. From petiole, they enter the branch and stem, and feed on xylum and phloem. This results in nonavailability of food material to the plants. When the plants are attacked in early stage, the upper half of the leaves show sign of gradual wit hering.

When grown up plants are attacked, they do not show any external symptoms of damage except the exit holes made by the maggots for emergence of adults. Infestation due to stem flies reduce the grain yield by 16 to 20%. With proper control measures atleast 12% yield loss can be avoided.

Control measures:

Soil application of Phorate 10 G @ 10 kg/ha or Carbofuran 3 G @ 30 kg/ha at the time of sowing will prevent early infestation by stem fly.

One or two sprays of 0.07% Endosulfan 35 EC or 0.03% Dimethoate 30 EC or 0.05% Quinalphos 25 EC can stop the damage.

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