DefinePK hosts the largest index of Pakistani journals, research articles, news headlines, and videos. It also offers chapter-level book search.
Title: Varietal Preference of Black Bug Cavelerius excavatus Distant (Hemiptera: Lygaeidae) on Sugarcane in Field
Authors: Noor Nabi Koondhar, Arfan Ahmed Gilal, Lubna Bashir Rajput, Sohail Ahmed Otho, Jam Ghulam Mustafa Sahito, Naimatullah Koondhar, Sajjad Hussain Rind, Fatima Imtiaz Nizamani
Journal: Journal of Agriculture and Veterinary Science
Publisher: Zoo Botanica (SMC Pvt.) Ltd.
Country: Pakistan
Year: 2024
Volume: 3
Issue: 3
Language: English
DOI: 10.55627/agrivet.003.03.0910
Keywords: ManagementgenotypesSugarcaneSindhDamageBlack BugDispersionLosses
Black bug, Cavelerius excavatus is a serious pest of sugarcane that causes huge losses under favorable conditions. Considering its recent losses in Sindh, Pakistan, this experiment was carried out at Sugarcane Research Institute, Agriculture Research Center, Tandojam to determine their population preference of Cavelerius excavatus on nineteen sugarcane varieties. The sugarcane varieties used in the study were NSG-45, B-46-364, BO 14, B-6705, B-6518, CO-419, CP-68-1059, CO-474, CO-616, CO-557, CO-235, B-54-142, CO-475, CO-620, LRK-2001, Raja-14, Q-88, PSTj-41 and LAmTj-76/803. The experiment was conducted in a RCBD design, and each variety was replicated five times. Weekly data was collected from both ratoon and newly grown crop of each variety from sowing till maturity. In each replication five randomly selected plants were observed to count C. excavatus population from the entire plants. Data on weather factors was also obtained. Results indicated that C. excavatus population was not found on all freshly grown varieties, but it attacked on all ratoon varieties grown, as none of the variety was found resistant. Maximum overall mean population of adults was recorded on LAmTj-76/803 variety (4.47±0.22 adults/ plant) followed by B-6705 (4.16±0.23 adults/ plant), PSTj-41 (3.54±0.23 adults/ plant), CP-68-1059 and Q-88 (3.53±0.21 adults/ plant) and BO-14 (3.51±0.23 adults/ plant). Overall, the lowest C. excavatus adult population was recorded on CO-475 (0.98±0.12 adults/) followed by CO-235 (1.19±0.13 adults/plant). Overall maximum mean population of nymphs was recorded on BO-14 and PSTj-41 varieties (3.20±0.21 nymphs/ plant) followed by LAmTj-76/803 (3.12±0.20 nymphs/ plant) and B-6705 (2.90±0.20 nymphs/ plant), hence treated as most susceptible. Minimum nymph population was recorded on CO-475 (1.12±0.11 nymphs/ plant) followed by CO-620 (1.38±0.12 nymphs/ plant), and CO-235 (1.43±0.13 nymphs/ plant) varieties. Among abiotic factors, temperature exhibited a significant, positive and moderate effect on the population of both adults and nymphs in sugarcane, whereas wind velocity showed a negative, moderate and significant effect on their population. Based on the findings, it is suggested that growing of sugarcane as ratoon crop should be avoided to save the crop by the losses of C. excavatus.
To determine the population preference of Cavelerius excavatus on nineteen sugarcane varieties under field conditions in Sindh, Pakistan.
The experiment was conducted at the Sugarcane Research Institute, Agriculture Research Center, Tandojam, using a Randomized Complete Block Design (RCBD). Nineteen sugarcane varieties were tested, with each variety replicated five times. Weekly data on Cavelerius excavatus population (adults and nymphs) was collected from both ratoon and newly grown crops from sowing to maturity. Weather data (temperature, relative humidity, wind velocity) was also obtained. Statistical analysis included Analysis of Variance (ANOVA), Least Significant Difference (LSD), and Pearson's correlation.
graph TD
A[Select 19 Sugarcane Varieties] --> B[Plant Sugarcane in RCBD Design];
B --> C[Collect Weekly Population DataAdults & Nymphs];
C --> D[Collect Weather DataTemp, Humidity, Wind];
D --> E[Analyze Data ANOVA, LSD, Correlation];
E --> F[Determine Varietal Preference & Environmental Impact];
F --> G[Conclude on Susceptible/Resistant Varieties & Recommendations];
The study confirmed that Cavelerius excavatus significantly prefers ratoon sugarcane crops over newly planted ones. The varietal differences in susceptibility suggest that host resistance can be a management strategy. The findings align with previous research indicating that ratoon crops are more vulnerable. The influence of temperature and wind velocity on pest population dynamics was also highlighted.
Cavelerius excavatus primarily attacked ratoon sugarcane crops, with no infestation observed on freshly grown varieties. None of the tested varieties were completely resistant. LAmTj-76/803 and B-6705 showed the highest overall mean adult populations, while CO-475 had the lowest. For nymphs, BO-14 and PSTj-41 exhibited the highest mean populations, with CO-475 again showing the lowest. Temperature had a significant positive effect, while wind velocity had a significant negative effect on the black bug population.
The research identified CO-475, CO-235, and CO-620 as relatively resistant varieties to Cavelerius excavatus in ratoon crops, while LAmTj-76/803, B-6705, and PSTj-41 were found to be highly susceptible. The study recommends developing resistant sugarcane varieties and paying more attention to monitoring and managing pests in ratoon crops.
1. Number of Sugarcane Varieties: The study evaluated nineteen sugarcane varieties. (Confirmed in text).
2. Pest Preference: Cavelerius excavatus was found to attack only ratoon crops and not freshly grown varieties. (Confirmed in text).
3. Environmental Factors: Temperature showed a significant positive effect, and wind velocity showed a significant negative effect on the pest population. (Confirmed in text).
Loading PDF...
Loading Statistics...