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Studied on the Occurrence and Control of Liriomyza in Ningxia

Author: LiuJunHe
Tutor: HeDaHan
School: Ningxia University
Course: Agricultural Entomology and Pest Control
Keywords: Ningxia Sativae Occur Prevention and cure Spatial distribution Cold resistance Hazard rating
CLC: S433
Type: Master's thesis
Year: 2005
Downloads: 124
Quote: 1
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Abstract


Leafminers (Liriomyza) is a class of major hazards of important pests of vegetables and flowers, resulting in crop severely affected. The majority of provinces have to find out the type of Liriomyza and Occurrence of Ningxia is still blank. Occurrence and Control of Liriomyza of Ningxia, Ningxia Agricultural production will have important guiding significance. Sativae September 2003 to January 2005, the author vegetable growing areas in Ningxia system research, the main findings are as follows: (1) the Ningxia the leafminers species identification, investigation showed that: Ningxia now found hazards Category 4 species of vegetables and flowers leafminers (Liriomyza): Liriomyza sativae the (Liromyza sativae) South America leafminers (Liriomyza huidobrensis), pea leafminers (Liromyza bryoniae), onions leafminers (Liriomyza chinensis), which South America sativae Ningxia new record types. (2) the biological characteristics of the leafminers Population fluctuation: Ningxia Lu onion fields onions sativae in late April began, and then gradually rise Sheng period in the mid and late July. Respectively, collected on Cineraria of Liriomyza sativae eggs, larvae, pupae and whole generation developmental threshold temperature was 8.5 ° C, 9.8 ° C, 10.2 ° C, 10.4 ° C, effective accumulated temperature · degrees respectively 52.7,75.8,158.5,262.2 Day . Cineraria on Liriomyza sativae year 7 generation. South America sativae cineraria, aster, cucumber, and peas on the developmental duration of the length of the order of cucumber gt; aster gt; Cineraria gt; peas, emergence rate order for peas gt; the cineraria gt; aster gt; cucumber. (3) South America sativae spatial distribution pattern on the host plant Phaseolus vulgaris: South America sativae distribution in broad bean plants are basically in line with the negative binomial distribution, are gathered type. According to the results of the horizontal and vertical distribution of Liriomyza sativae before harm peak to the central and central parts of the plants for insects Road density is large, significantly greater than in the upper part and the upper part, which following the most prominent in the lower part and lower still accounts for more than 60% of the whole plant, the upper portion of only 40%. (4) mixed hazards and their prevention and control technology: common bean Liriomyza sativae, Liriomyza huidobrensis pea leafminers number ratio of about 3:2:1 the leafminers mixing occurred District Control Index 1.5 / leaves. (5) sativae pupae the cold hardiness Analysis: With the extension of the duration and temperature reduction at low temperatures, elevated Liriomyza sativae pupae mortality decreased survival in -15 ℃ leafminer survival rate of 0. Liriomyza sativae in Yinchuan area can not overwinter. (6) vegetables plum beans hazard loss fire analysis: sativae harm kidney bean leaf area and photosynthesis indicators for multivariate regression model analysis obtained the following conclusions: the model estimation results for Y = 12.82-3.50X 1 17.36X 2 -0.17X 3 determine coefficient R 2 = 0.984, F test value F = 21.093, illustrate a high degree of goodness of fit Strong, significant.

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CLC: > Agricultural Sciences > Plant Protection > Pest and Disease Control > Plant pest and its control
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