FURTHER OBSERVATIONS ON THE BIOLOGY OF THE CABBAGE ROOT FLY, ERIOISCHIA BRASSJCAE BCHÉ

In 1951, eggs of Erioischia brassicae were first found in the field on 2 May, and the peak period of egg-laying occurred 19–31 May. This was up to a month later than in the period 1948-50.
The periodic removal and examination of the surface soil showed that eggs of E. brassicae were continuously present on the host plants from mid-June to early November. Plants under observation during this period showed an average of 285 eggs per plant and other plants exposed to attack from July to November showed an average of 162 eggs per plant. Peak periods of egg-laying, as indicated by numbers of eggs per plant per day, occurred in late June and early July, in mid-August and, to a less extent, in the first half of October. The plants showed no increase in the rate of infestation as the season advanced, although E. brassicae has a reproductive capacity of about 100 eggs per female and three to four generations a year.
The difference between the observed egg populations and pupal populations indicated that E. brassicae had a heavy mortality rate in its immature stages. The condition of puparia showed that the species was subject to a high degree of natural control, a fact for consideration when direct control measures are formulated.
Pupal diapause extending from October 1949 to May 1951 was observed in one specimen of E. brassicae and from October 1949 to August 1951 in one specimen of its Hymenopterous parasite, Trybliographa rapae Westw.
Tests with tar-oil winter wash showed that at a concentration of 1 1/4% it killed eggs of Erioischia brassicae and repelled gravid females for approximately a week. Laboratory tests with BHC indicated that it had no adverse effects on the eggs but was larvicidal.     

THE EFFECT OF CERTAIN PREDATORS ON THE NUMBERS OF CABBAGE ROOT FLY (ERIOISCHIA BRASSICAE (BOUCHÉ)) AND ON THE SUBSEQUENT DAMAGE CAUSED BY THE PEST

To determine the importance of beetle predators on the natural control of cabbage root fly, experiments were carried out in 1958 and 1959 using various types of barriers to obtain different levels of beetle populations on cauliflower plots. A barrier of DDT-treated straw, placed in the soil around some plots, decreased the numbers of beetles within them and allowed a greater number of eggs and larvae of cabbage root fly to survive than on the untreated plots, resulting in a greater crop damage. Another type of barrier allowed the beetles to enter plots but made it difficult for them to leave. On these, fewer cabbage root-fly eggs and larvae survived and the crop damage was much less than on the plots surrounded by straw barriers. Where plants were treated with insecticide the root-fly population was reduced to a minimum and crop yields were considerably increased. The insecticide, however, caused a reduction in the numbers of predatory beetles.     

白菜乳酸菌混菌发酵的研究

研究了大白菜乳酸菌乳链球菌DM 2 2和植物乳杆菌UM 2 2混合发酵中的生长和产酸以及环境因子的影响 ,并对混菌发酵的风味物质作了分析。结果表明 :混菌发酵中 ,DM2 2在发酵前期生长迅速 ,是优势菌群 ,而UM2 2在发酵后期占主导 ;发酵温度、发酵剂组成以及发酵液盐浓度都会显著影响混合发酵中菌的产酸代谢 ;发酵风味物质与单菌发酵区别明显。     

STUDIES ON LUMINOUS BACTERIA : II. THE INFLUENCE OF TEMPERATURE ON THE INTENSITY OF THE LIGHT OF LUMINOUS BACTERIA.

1. A method has been described whereby the intensity of the light of luminous bacteria may be measured in a quantitative manner. 2. It is pointed out that the temperature coefficients for light intensity do not follow the van''t Hoff rule, but are higher and vary with each 10° temperature interval. 3. From a comparison with other data it is found that the process is not a simple one, but that the observed curve is the resultant of several reactions which proceed simultaneously. 4. The discrepancies in the temperature coefficients in the neighborhood of the "optimum temperature" may be due to a process of coagulation of the colloidal particles of the enzyme. This coagulation will tend to cause a deviation of the curve away from that normal for chemical reactions.     

FIELD TRIALS OF THE EFFECT OF ALDRIN ON CLUBROOT OF SUMMER CABBAGE

Field experiments were carried out from 1956 to 1958 on the effect of soil applications of aldrin on clubroot disease of summer cabbage. In the first two seasons the compound was applied either as a dust, broadcast and worked into the soil, or as an emulsion watered round the plants. Results in 1956 were inconclusive and the same plots were used again in 1957, the same quantities of aldrin being re-applied. In this season increasing doses of the compound gave increasing control of the disease. The treatment of individual plants with emulsion was more successful than the application of dusts.
In 1957 half of each plot received a heavy dressing of ground limestone. Lime alone gave a control equal to that given by the highest aldrin treatment. Lime and aldrin together gave a further reduction in clubbing.
In 1958 increasing doses of emulsion were tested. These gave increasing control of disease but the higher doses caused some phytotoxicity which was reflected in a delay in maturation of the crop.
A reduction of clubbing from 'severe' to 'moderate' caused a marked increase in crop, but further reductions in clubbing did not result in any corresponding increase in crop weight.     

九种金属离子对桑椹红色素稳定性影响的研究

本文报道Fe~(2+),Fe~(3+)……Ca~(2+)等9种金属离子对桑椹红色素稳定性影响的研究。结果表明:Fe~(2+),Fe~(2+),Cu~(2+),Zn~(2+)对该色素颜色的稳定性有不利影响;Mg~(2+),Al~(3+),K~+,Na~+,Ca~(2+)等5种金属离子有增强其吸收值的作用,其中Al~(3+)增色作用最为明显,Ca~(2+)护色作用较为突出,但它们的作用都随时间延长而逐渐降低。     

PRIMARY CULTURES OF THE CELLS FROM OVARIES OF THE CABBAGE ARMYWORM, MAMESTRA BRASSICAE L. (Lepidoptera: Noctuidae)

Ovaries from post-diapause pupae of the cabbage armyworm, Mamestra brassicae , were cultured. Three types of cells migrated from the explants. Epithelial-like cells formed confluent monolayers, and fibroblast-like cells formed cellular networks. Isolated cells were distributed around the explants. Epithelial-like cells and isolated cells were common, and fibroblast-like cells were rather rare. The migrated cells survived for more than 6 months, although mitoses were rarely observed.