Mango Diseases: Impact of Fungicides

Mango, Mangifera indica L., is known to be the king of all fruits due to its delicious taste, marvelous fragrance, and beautiful appearance. However, several infectious diseases caused by many phytopathogens are deteriorating mango quality and quantity. Mango tree and fruit have been affected by about 83 diseases reported worldwide, and in Pakistan, 27 diseases are recognized as more important. Disease control always remains a challenge for the farmers to get optimum production especially due to pesticide resistance. Resistance to fungicide in current days is a major threat to plant disease management. In many cases, plant pathogen resistance could develop naturally; thus, several newly developed chemistries of fungicides remain at high risk. However, research toward an increase of resistance and delay in disease development has been undertaken. Existing fungicide chemistry, sometimes, renamed with new trade name does not satisfy the farmer to apply such fungicides for disease management. However, chemical fungicides are believed to be a significant way to control fungal pathogens or sometimes to inhibit and prevent the development of pathogens. However, due to pathogen resistance development, it is hard to manage plant diseases. Therefore, the impacts of such fungicide management in some important mango diseases are discussed in this chapter

A mini review on the Lactic Acidosis in goats and its remedial approaches

The current study was performed in order to investigate the threat of lactic acidosis in goats worldwide and explore the curative strategies. In this regards a detailed review was performed, however obtained facts were found to be much interesting and valuable. It was indicated by researchers that lactic acidosis is the most common problem in goats throughout the worlds. It represents significant economic loss due to direct and indirect effects. It was further stated that goats with lactic acidosis show decreased body temperature up to 98.1±0.89 °F, rumen and intestinal movement 0.23±0.48/m, rumen pH 4.8±0.07, blood pH 7.1±0.08, increased respiration rate 56.14±7.15/m and heart rate, 136.28±4.71/m. Affected goats also show signs of dyspnea, anorexia, inactivity, incoordination and recumbancy. The glucose level remains 190.14±36.49 mg/dl, total bilirubin 0.75±0.04 mg/dl, direct bilirubin 0.27±0.03mg/dl, indirect bilirubin 0.40±0.03 mg/dl, alanine aminotransferase ALT 36.42±3.04 U/l and alkaline phosphatase 420±3.65 U/l. Furthermore, Glucose level, total bilirubin, direct bilirubin, indirect bilirubin, ALT (SGPT) and alkaline phosphatase increase with treatment of Cassia Fistula, serum biochemical changes rapidly return to normal compared to treatment with Sodium bicarbonate or Magnesium hydroxide. The ruminal juices changes are also significantly improved with the treatment. The changes in the ingesta color, odor and consistency and rumen pH return to normal with the use of Cassia Fistula, Sodium bicarbonate and Magnesium hydroxide. In conclusion, Cassia fistula, Sodium bicarbonate and Magnesium hydroxide could be used as valuable strategies against lactic acidosis in goats. These therapies have been proved to be effective for treating the acidosis in goats.

Population Density of Foliage Insect Pest on Jujube, Ziziphus mauritiana Lam. Ecosystem

Jujube, Ziziphus mauritiana L. is the King of arid zone fruits, due to its adaptations to tolerate the biotic and abiotic stresses. However, the occurrence of insect pest is the major threat to reduce the quality and quantity of fruits. The current studies are the first comprehensive evidence on the population density of foliage insect pests evaluated on two different varieties, Golden Gola (susceptible) and White Kherol (resistance) at farmer’s field Tando Qaiser, District Hyderabad during 2007 and 2008. A total of 13 different insect pests which were categorized as major (Ancylis sativa, Euproctis fraterna and Adoretus pallens), minor (Scirtothrips dorsalis, Amrasca biguttula biguttula, Myllocerus discolor, Achaea janata, Agrotis biconica and Aphis gossypii) and occasional (Oxycareous hyalinipennis, Dichromorpha viridis, Tarucus balkanicus and Orgyia postica) based on overall population of two years. The mean population percentage of insect pests indicates the highest percentage for E. fraterna followed by A. pallens, A. biguttula biguttula, M. discolor and S. dorsalis on White Kherol, whereas, Golden Gola was severely infested and showed maximum percentage with A. sativa followed by E. fraterna, S. dorsalis, A. pallens and A. biguttula biguttula. It is concluded that A. sativa, E. fraterna and A. pallens are serious insect pests of jujube. Pest monitoring with direct count and light trap can help to determine the ETL that is most important for the management of various insect pests including these major and minor pest. The present study will hopefully be helpful for management of foliage insect pests of jujube.

Identification of Colletotrichum Species Associated with Blueberry Anthracnose in Sichuan, China

Anthracnose caused by Colletotrichum spp. is an important disease of blueberries and results in large economic losses for blueberry growers. Samples of anthracnose were collected from six main blueberry cultivation areas in Sichuan Province. In total, 74 Colletotrichum isolates were obtained through a single-spore purification method and identified to the species through morphological characteristics and phylogenetic analyses based on partial DNA sequences of glyceraldehyde-3-phosphate dehydrogenase (GAPDH), internal transcribed spacer (ITS) regions, and the β-tubulin (TUB2), actin (ACT) and calmodulin (CAL) genes. Among all species, Colletotrichum fructicola was the most dominant species, with an isolation percentage of up to 66.2% in Sichuan, followed by Colletotrichum siamense (17.6%), C. kahawae (5.4%), C. karstii (5.4%), C. nymphaeae (2.7%) and C. sichuaninese (2.7%). Pathogenicity tests showed all species were able to cause typical anthracnose symptoms on blueberry leaves and stems. Colletotrichum fructicola was the predominant species with strong aggressiveness. Moreover, C. fructicola, C. kahawae, C. sichuaninese and C. nymphaeae are first reported here to cause blueberry anthracnose. This study provides a comprehensive reference for the association of different Colletotrichum spp., which may support the sustainable management of blueberry anthracnose

Population Density of Foliage Insect Pest on Jujube, Ziziphus mauritiana Lam. Ecosystem

Jujube, Ziziphus mauritiana L. is the King of arid zone fruits, due to its adaptations to tolerate the biotic and abiotic stresses. However, the occurrence of insect pest is the major threat to reduce the quality and quantity of fruits. The current studies are the first comprehensive evidence on the population density of foliage insect pests evaluated on two different varieties, Golden Gola (susceptible) and White Kherol (resistance) at farmer’s field Tando Qaiser, District Hyderabad during 2007 and 2008. A total of 13 different insect pests which were categorized as major (Ancylis sativa, Euproctis fraterna and Adoretus pallens), minor (Scirtothrips dorsalis, Amrasca biguttula biguttula, Myllocerus discolor, Achaea janata, Agrotis biconica and Aphis gossypii) and occasional (Oxycareous hyalinipennis, Dichromorpha viridis, Tarucus balkanicus and Orgyia postica) based on overall population of two years. The mean population percentage of insect pests indicates the highest percentage for E. fraterna followed by A. pallens, A. biguttula biguttula, M. discolor and S. dorsalis on White Kherol, whereas, Golden Gola was severely infested and showed maximum percentage with A. sativa followed by E. fraterna, S. dorsalis, A. pallens and A. biguttula biguttula. It is concluded that A. sativa, E. fraterna and A. pallens are serious insect pests of jujube. Pest monitoring with direct count and light trap can help to determine the ETL that is most important for the management of various insect pests including these major and minor pest. The present study will hopefully be helpful for management of foliage insect pests of jujube.

Effect of Different Diets on The Development and Morphometric of Coccinella septempunctata (Linneous)

A laboratory experiment was carried out to determine the effect of different diets on biology of Coccinella septemputata Linneous, in the | department of Plant protection, Sindh Agriculture University, Tando Jam, Pakistanduring 2011 and 2012 at 28±2 ºC and 65±5% relative humidity. The result showed that total larval developmental period was recorded 8.0 ± 0.72 and 7.8 ± 0.69 days on grain moth eggs and safflower aphid, respectively, however, no significant difference was recorded between pre-pupal and pupal period on grain moth egg and safflower aphid. The adult longevity of male (43.10 ± 1.04 and 56.50 ± 1.61) and female (36.07 ± 0.24 and 42.50 ± 0.69 days) was significantly different on grain moth eggs and safflower aphid, respectively. The larval instars were not survived on prepared artificial diet, however, only adult male and female survived (68.50 ± 2.03 and 72.90 ± 2.07 days) without fecundity. The result further revealed that the length and breadth (mm) of larval instars, pupa and adults of C. septempuntata was significantly varied feeding on grain moth eggs and safflower aphid

Characterization and Pathogenicity of Fusarium Species Associated with Soybean Pods in Maize/Soybean Strip Intercropping

Intercropping has been considered as a kind of a sustainable agricultural cropping system. In southwest China, maize/soybean strip intercropping has commonly been practised under local limited agricultural land resources. However, heavy rainfall in combination with high humidity and low temperatures cause severe pod and seed deterioration in the maturity and pre-harvesting stages of intercropped soybean. Numerous Fusarium species have been reported as the dominant pathogens of soybean root rot, seedling blight, as well as pod field mold in this area. However, the diversity and pathogenicity of Fusarium species on soybean pods remain unclear. In the current study, diseased soybean pods were collected during the cropping season of 2018 from five different intercropped soybean producing areas. A total of 83 Fusarium isolates were isolated and identified as F. fujikuroi, F. graminearum, F. proliferatum, and F. incarnatum-equiseti species complex based on morphological characteristics and phylogenetic analysis of the nucleotide sequence of EF1-α and RPB2 genes. Pathogenicity tests demonstrated that all Fusarium species were pathogenic to seeds of the intercropped soybean cultivar Nandou12. Fusarium fujikuroi had the maximum disease severity, with a significant reduction of seed germination rate, root length, and seed weight, followed by F. equiseti, F. graminearum, F. proliferatum, and F. incarnatum. Additionally, the diversity of Fusarium species on soybean pods was also considerably distinct according to the geographical origin and soybean varieties. Thus, the findings of the current study will be helpful for the management and resistance breeding of soybean pod decay in the maize/soybean intercropping system