Control methods of APHIS gossypii in ornamental trees
Distribution and damage of oleander aphid AphisneriiBoyerdeFonscolomde, also known as oleander yellow aphid. Belongs to Homoptera, Aphididae. Distributed in Changchun, Shenyang, Baotou, Taiyuan, Ningbo, Guiyang and Urumqi. Prickling is harmful to the new shoots and tender leaves of oleander plants, affecting the normal growth and flowering of plants.
Morphological characteristics wingless female aphid body length 2 mm, body apricot yellow, antennae dark brown, foot black, tail tongue-shaped, with 11-14 curls. The winged female aphid has oval shape, black head and chest, black markings on the abdomen and thick wing veins. The nymph is wingless and looks like an aphid.
The living habits occur for more than 10 generations a year, and the aphids survive the winter in new shoots, branches and skin cracks. From May to June of the following year, the number was large, the reproduction was fast, the whole tender shoots and young leaves were covered with aphids, and the population density decreased in the high temperature and rainy season. There was another small peak from September to October and overwintered one after another with the decrease of air temperature in November. the high temperature in the greenhouse in the north was beneficial to the reproduction of the aphid.
Integrated prevention and cure
(1) strengthen maintenance and management, moderate pruning, make it ventilated and transparent, and create conditions that are not conducive to the life of aphids.
(2) protect and utilize natural enemies such as aphid cocoon wasps, lacewings and ladybugs. The method of artificial migration of natural enemies can also be used to increase the number of natural enemies and enhance natural control.
(3) the chemical control should be sprayed with 100x Anna solution or 12.5% Bilin 4000-fold solution during the damage period.
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How to propagate oleander
Oleander blossoms from May to October, and the flowering period is as long as half a year, so it is also known as "half a year red". The main means of propagation of oleander are cutting and sowing 1) during cutting and pruning, the small lateral branches germinated from the trunk of oleander should be often cut off so as not to interfere with the shape of the tree and consume nutrition. Using these small lateral branches as propagation materials, it is easiest to survive after cutting. These branchlets are relatively short, although thin and weak, but the tissue is more substantial, with terminal buds at the same time, and form faster after rooting. Before cutting the above insertion
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Brown spot of oleander, a medicinal plant
Oleander scientific name NeriumindicumMill. It belongs to the woody plant of Apocynaceae. Used in medicine with leaves and flowers; poisonous. It has the effect of strengthening heart and diuresis, eliminating phlegm and killing insects. It is distributed in most provinces and autonomous regions of the country. The main symptoms were harmful leaves, the purplish red dots appeared at the tip or edge of the leaves, and then expanded to form round, semicircular or irregular brown spots. There are wheel marks on the disease spot. In the later stage, the center retreated to white, and the edge was wider in reddish brown. When the humidity is high, the grayish brown mildew layer can grow on both sides of the disease spot, that is, the conidiophores and conidia of the pathogen. Disease
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