Investigation on the radial growth of Carya illinoensis and the control effect of Anoplophora chinensis
In order to clarify the radial growth characteristics and the damage of diseases and insects in Carya illinoensis,the efficient and economical control measures of Anoplophora chinensis were explored.The Carya illinoensis planted in Changfeng County,Hefei,Anhui Province was taken as the test object,and the radial growth model of Carya illinoensis was established by using Logistic equation to fit the process of the change of breast diameter with tree age.The occurrence of diseases and insect pests in Carya illinoensis was investigated by general survey method,and the control experiment of Anoplophora chinensis with different agents was designed according to the results of the pest investigation.The experiment was divided into 4 groups:2%thiacloprid 1000 times liquid+40%toucui 30 times liquid(CF-1);40%thiacloprid 1000 times liquid+40%toucui 30 times liquid(CF-2);40%thiacloprid 1000 times liquid+silicone 500 times liquid(CF-3);the control group(CK)was set up with clean water+40%toucui 30 times solution.The large scale control practice was carried out for the combination with good experimental effect,and the benefit of control was analyzed statistically.The radial growth results showed that the net increase in diameter at breast height was 32.34 mm between 2018 and 2023.Compared with 2018,the diameter at breast height increased by 267.94%.The net growth of diameter at breast height showed a parabolic trend with the change of tree age,and the logistic growth curve showed an"S"shape.Curve,the growth rate of diameter at breast height shows a"slow-fast-slow"trend.1 to 18 years is the period of rapid growth of the diameter at breast height of Carya illinoensis.After 18 years,the changes in diameter at breast height tend to be stable.The survey results of pests and diseases showed that the diseases and insect pests that cause serious harm to pecans mainly include stem-boring pests and leaf-eating pests.There are four types of pests,sucking pests and seed pests.Among them,stem-boring pests were the most serious.Stem-boring pests are represented by Anoplophora chinensis.In 2021,the total damage rate of the standard plot of the base was 24.72%,and the damage rate in the middle of the trunk was higher,up to 36.11%.In 2022,the damage rate of Anoplophora chinensis in the transplanting area of the park was higher than that in section 1 and section 2.The diameter at breast height of the damaged forests of the same age ranges from 2 to 10 cm,and the diameter range of most of the damaged plants is from 5.0 to 6.9 cm.The results of different drug combinations on Anoplophora chinensis control test show that the combination of CF-2 control the effect was the best,with obvious effects appearing one day after the pesticide is sprayed.The insect population reduction rate reaches 16.66%,and the insect population reduction rate reaches 100%on the 5 d.The control effectiveness of CF-3 combination was about 70%.The analysis of the large-scale control effect and benefit in 2021 and 2022 showed that,the comprehensive use of"40%thiacloprid 1000 times the liquid+40%toucui 30 times the liquid+silicone 500 times the liquid"had significantly reduced the cost of control and has high application value.The above results showed that silicone has potential substitution value for toucui,and can be considered comprehensively in practical production combined with the control cost,which provided a reference for the efficient cultivation of Carya illinoensis.
Carya illinoensisradial growthLogistic growth modelpest surveyAnoplophora chinensis control
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