Army worms are also known as crown nets. It mainly damages azaleas and plants and affects the growth and flowering of azaleas.
1. Morphological characteristics
1.1 army adult insects 3.5 mm long, dark brown.
1.2 Army nymphs body length 1.9 mm.
2. Habits
2.1 usually occurs every 4 to 5 generations.
2.2 Army worms use adult larvae, plant cracks, and soil gaps to overwinter.
3. Damage characteristics
3.1 Adults and nymphs suck the juice of azaleas on the back of the leaves and affect the growth and development of the plants.
3.2 The chlorosis of the victim's leaves is pale, yellow-brown stains appear on the back of the leaves, and the leaves fall off early.
4. Control methods
4.1 Clear garden leaves and weeds to eliminate overwintering adults.
4.2 Rhododendron cultivation in shady, cool and ventilated places can reduce the damage caused by military and animal pests.
4.3 The maternal adult pest occurrence period, especially when the first generation of insect pests occur, can be used 80% DDVP EC 1000 to 1500 times; or 40% Dimethoate 2000 times; or 50% CASSIL emulsion 2000 times; 50% phoxim EC 1500 to 2000 times spray control, have a good control effect.
4.4 anti-drug spray interval 7 to 10 days, 2 or 3 times in a row.
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